The ICC buff has been applying to priest shields both in & out of ICC. Doing a quick bit of maths with the formula I am still of the belief that the 30% ICC buff is still being applied to shields post patch.
I have to admit having the unused absorb tracked rather than getting hit by mobs & adding the absorbs is a lot easier on time and pocket.


3829 spellpower pre patch = 11650 shield absorb 1710 glyph heal
4412 spellpower post patch (same gear) with 36% mastery = 10871 shield absorb 1696 glyph heal.

LK won't be any more difficult.

Is the PoM>CoH>Renew a priority list? If so I don't know how your PoM heals more than your CoH. CoH always takes priority as Holy. It will be your #1 heal every night and virtually every encounter since 4p set bonus. Obviously keeping PoM on CD off of the tank typically and sometimes elsewhere when tank range is an issue for procing it it's 5 times. And a stat weight of 3.00 on haste for HOLY? CoH/Renew/PoM are instant cast and with mid-level (400-600) haste you can't get much better than 1.25-1.18 flash heals. Spirit DOES help our regen immensely and does not deserver a 0.00 stat weight in Holy AT ALL. I raided 25hm dreamwalker tonight and had downtime just prior to kill after burning through my mana with a full mastery spec. I immediately hearthed to Dal as I knew that wasn't going to fly for Sindy and LK and swapped back to spirit set. I still had mana issues even with an innervate. I had to wait for SF in p3 for 14 seconds sitting oom just tossing 1-2 regen-as-they-come heals while I waited.
As far as the Chakra state goes I have found a place fr it in EVERY encounter in ICC. Esp PUT/BPs/BQ/Sind/LK for te AE state and Dreamwalker for the Renew state. The problem with mana is that Heal is JUNK and slow and Flash heal is sexy with teeth for tanks and double stacking sernedipity for going into AE Chakra state...this our best throughput atm but it is VERY mana innefficient. The typical Flash/PoM/CoH/Renew rotations still work well, but the more you cast Flash the faster you will OOM.

On a positive note our Disc priest healed for 24k HPS on LK tonight...overall fight numbers weren't off the charts, but that shows you how much full masteried shields are sorbing.

EDITED FOR HAVOCS COMMENT TO ME:
it IS refreshing 4 seconds per target hit on PoH, which makes this even more of a reason to find a way to utilize this state. Rotation is a bit tricky, but not hard

Thank you much for the Holy rewrite!

I agree 99.9% with that talent tree. The only statement I would add is if you find yourself dying a lot, analyze your use of binding heal vs Flash heal. Consider Binding. If that doesn't help, skip one SoL for Desperate Prayer.


Also Hegen, last I checked Light only had one L (Surge of Lightl?). <3


I'd also like to point out a few nifty little things I discovered in my first night in ICC.

-I had slight mana issues with appx 1400 spirit, but when I eased back my spamming it relaxed. Remember, you can take your chakra all the way down to 30 seconds, let it tick a bit. I was finding myself adding extra renews to maintain it at 30 seconds, however with the upcoming decrease to the Chakra cooldown (30 seconds, down from 1 min) I am able to ease back a lot.

-As someone aptly pointed out, PoH can be much easier to maintain than you think. EACH PERSON that a PoH hits g ives you the time back, so if you hit a 5 person PoH that's 2/4 seconds X 5 people. This makes it much less clunky while still giving an amazing Holy Word: Sanctuary. I started throwing that around for fun during decimates on stinky/precious and was subsequently asked to use that chakra more often.

- My love affair with Lightwell has been rekindled and no one can take it away. For the uninformed, Bliz did change it, and here is how:
Lightwell can be used from a distance of appx 20-30 yards (idk how far really, but that's what it seems). Lightwell can no longer be spammed by users, when you have the HoT you have to wait for it to go away. Lightwell can be clicked while stunned ("What? I can heal myself during Tear Gas? He** yes!"--From a raider last night). In Cataclysm when we become short on mana, Lightwell will give free HPS for those whose raiders/party members are informed of the benefits. I forsee this being a very useful tool to train your raid to use now.

The Chakra PoH mechanics is indeed worth adding to the FAQ.

This, however, while true, isn't new. Both the requirement to let it tick out and the ability to use it while CCed (everything except MC works) have been active since start of the WotLK expansion. I have used it in Naxxramas at Maexxna to give the tank some self-heal when webbed (especially useful in 10 man without resto druid).

I am also trying to figure out ways around the mana issues. I find myself on most fights running dry with everything on CD by the last 5-10% of the fight. Using SF early so it is back up again at the end of the fight helps but the biggest thing that has helped is using more Chakra: PoH and less Chakra: Renew. While using renew chakra I get a little spammy and blanket the raid in renews. I find myself at >50% mana 30secs into the fight which is just awful. Using the Chakra:PoH it is much easier to maintain and I find myself using more of the playstyle I did pre-patch. Also, Holy Word: Sanctuary is the better of the 3 thus far. After using this and having less trouble with mana I will be switching SoR back out in my talents. (I actually specced it before last night because I found myself forcibly dying with the boss >10% just because my mana problems were that bad and SoR let me actually finish the fight)

Overall though I love the changes. It has been a lot of fun so far and will only get better with Chakra CD being reduced to 30 secs, further increasing the sort of customization that comes along with it.

Also have a look at your overheal while doing this. I suspect that with current fights you end up with significantly more than 50% overheal on Renew if you really spam it.

As for the FAQ, I'll be waiting for more feedback while I'm away for a week, but I can see nudging the holy build more towards efficiency. My current take though is that holy priests just aren't meant to really spam Renew like Disc priests used to spam shields. I think that which you describe in your post is the way to go: sit back for a moment and try other healing methods then look how that goes, instead of blindly trying to acquire the efficiency to be able to maintain existing healing styles.

- I agree with poster conclusions, just let me add a remark on the effectivity of HoT part. (Logs) from ICC raid suggest, that when renewed before expiration, the HoT keeps its highest previous value.
- It may be noted that it is triggered by quite a number of abilities that are not understood as direct heals by the priest community (CoH, trinket proc, Blessed Healing as seen in the log)
- As a result Havoc's formula may be very conservative and actual results will be better.

I'm pretty sure it's not a deterministic mechanism, as I've shown in that thread. Ticks are sometimes not deduced when they happen close to a refresh, but it's not systematic (and I guess neither deliberate)

The reason why you get 7 ticks is simple. The mechanism of the HoT refresh is just like any other HoT refreshed by another spells, like renew with heal for example. If you renew your self and spam heal you will notice that hte duration of the new renew is sometimes 16 instead of 15. The reason is the method that is used to keep the HoT ticking at the same interval despite the refreshed duration. When heal the time remaining until the NEXT renew ticks occurs is transferred onto the refreshed renew. That way when the refreshed renew hits 15 it will tick again and the time between the ticks is preserved. Let me make this more clear. Lets say your heal lands 1 second after a renew tick and you have 0 haste. That means there are 2 seconds left over until the next renew ticks. The new renew duration will be 17 seconds and you will get a tick at 15, 12, 9, 6, 3 and 0. So that is 6 ticks instead of 5.

I think this really explains what is happening with EoL. I believe that your assumption that is a timestamp/lag issue is incorrect. I think due to the way the HoT is refreshed the EoL HoT gets an extra tick everytime it is refreshed and that extra tick is added into the bank. I suspect the system kind of "transferrs" a tick, so the tick that is gained by EoL has the value the EoL ticks had before your new heal landed. That way although one tick is lost just before your spell landed a tick of the same value is added by the HoT refresh. The result is the last tick before the new spell lands is ignored. The evidence for this is the HoT ticking 7 times and the fact that the last tick seems to be ignored everytime even when the EoL tick occurs over half a second before the new flash heal lands. I think if a spell at effectively the same time as an EoL tick then the EoL hot will not gain an extra tick from the refresh and this problem will not occur.

Here is an example
This is my renew. Due to my haste I have 5 ticks and duration is somewhere between 12-13 seconds (haste is 18.33%)

Now watch what happens when I refresh the duration of renew with heal

I just realised that renew ticks 7 times after my heal lands. I did a few experiments and after removing all my haste and timing heal to land appropriately I found that what is actually transferred here is not just the remaining time before the next tick, but a full tick as well. So if my heal hits early enough I get 17 seconds duration. The minimum is 15. That means I get one extra tick + the remaining time. So if my heal lands 2 seconds before a renew tick would occur the new renew duration will be 17 seconds. This is probably a bug. I think someone forgot the duration of renew was reduced to 12 and they are still using a 15 second base time. It may be by design though.

A similar thing is happening with EoL except we only get the remaining time not the full extra tick. I personally always see an extra tick on refreshed EoL, but I suspect if you repeated it enough, by accident a heal might land at exactly the time a tick happens and then you won't get an extra tick. You can see this happening in action. If you cast any heal without EoL you will notice that the duration of the buff that you see is 5 seconds. That is because, it starts at 6.0 exactly and there is a very slight delay before the buff appears so the duration is 5, but when you refresh the buff sometimes the duration appears to be 6 and immediately goes to 5 or it will stay 6 for a fraction of a second and then go to 5. This because the actual duration of the new HoT is 6+ the remainder so you have time to see the 6sec on your screen. The extra tick occurs when the duration runs down to exactly 6 seconds. I think this extra tick is added to a bank, but I think when the calculation of the bank occurs the extra tick is counted as though it had a value according to the previous bank. I think if the heal lands at exactly the time a tick occurs this problem the refreshed EoL may have 5 ticks only and this problem will not occur


[edit] When I tried stacking it just now I seemed unable to get it past 900 which is the value I would expect for my flash. Maybe they hotfixed it

I have raided ICC and did a lot of swapping between the 2 specs. I was partnered with a holy spec priest who had no practice with the spec (or healing for that matter) so for the most part I was solo healing. After Marrowgar I asked the other healer to focus on tanks alone except on Saurfang. I couldn't properly keep anyone up if I had to constantly spam the tanks with my highest cost heal.

Gear:
I was in T10 4piece, 264 legs and cape, and 251 everywhere else except a 200 trink, 219 neck, and 232 boots.
Gemmed Int in red, int haste in yellow, int and spir in blue. All gear reforged off spirit for mastery.


Disc:
I used disc for Deathwhisper, Saurfang, and Rotface.
On Deathwhisper it was nice that I could spamheal the group with Prayer of Healing when needed without mana worries. Mainly because I could easily restore a good chunk of mana by targeting her shield and spamming 5 smites for the archangel pop.

On Saurfang since there is very little raid damage I let the other healer focus on raid while I focused on the melee and tanks. Basically I just targeted the boss and spammed smite, holy fire, and penance. To be honest I took complete advantage of Attonement and spent my time in this fight trying to dps. I pulled between 3k and 4k without heroism. At the same time the tanks and melee all stayed above 80% at all times. It was great and we burned him down exceedingly fast.

On Rotface it was a bit more challenging healing because of having to run and drop off slime as well as keep up the group alone as the other healer died right off, but it went alright. The worst moment was when the raid just did not move from the vomit and eventually people fell below 30%. I popped PW:B and Divine Hymn. Glyphed PW:B so it brought the raid up pretty quick. The remainder of the fight I was able to just spam smite and keep the raid above 40%. I would pop arc and spam PoH to bring people back to full.



Holy:
I used holy for Marrowgar, Battleship, and Festergut.
On Marrowgar it was pretty easy to heal with. I kept up the PoH chakra and kept a sanctuary under the boss. With the sanctuary up, Circle of Healing, and regular Prayer of Healing, it was a pretty simple fight. Everyone stayed in the sanctuary and it was easy to heal through bone storm.

The Battleship was trivial. It's not really much of a boss. Drop a Sanctuary offcenter on the IF ship, Renew jumpers, Circle of healing when needed, Prayer of Healing to keep chakra up. Simple

Festergut was the biggest problem. I was the healer kept at range which helped a little. I again kept up sanctuary on the boss which kept melee and tanks up a bit. It required using CoH on cooldown and a lot of renew and prayer of healing. It was the only fight in the entire run that I had to use my Shadowfiend to keep mana up. It was a constant healspam.


Overall I prefer Disc spec on stationary fights and its a great tank/melee healer. Holy is good for quickly healing up the raid and is exceptional on fights where the entire raid stacks on the boss.

After patch applied today morning, Atonement is working at least for non-grouped scenario as seen in the log.