Their proc "chance" is based on the "base weapon speed". This means the faster you hit, the more it procs since the "chance" to proc does not go lower as you start to hit faster with your weapon.

You've answered your own question, to the best of our ability. Use the spreadsheets. It *will* depend on gear - your current hit rate, your ArP, and whether/not you have 4pt8.

In all three of those cases, you may be able to squeeze a little extra DPS (esp. w/ a faster OH) by swapping out MP points for TtT.

Is there some major flaw in [Insanity's Grip] that I can't see? I could see the expertise being unwanted depending on gearing (and I only have a handful of Ulduar gear so far), but maybe I'm missing something vital.

If you're referencing it not being in the op, that list is a bit dated and it's possible it wasn't discovered yet (i.e. [Combatant's Bootblade]). I think it's pretty obvious it's better than [Calamity's Grasp] if it's not pushing you over on expertise.

Cookie cutter combat spec you'd have exactly 1 point to spare for Thrown Spec. That is probably enough.

A caveat worth mentioning, as combat you have one "filler" point left over to place as you see fit, however, unless you spec into CQC, you're stuck putting that point into endurance as you won't have enough talent points to move further up the tree otherwise (assuming 2/2 in Improved SS, 5/5 in DW Specialization, and 5/5 Precision).

Take a look on this spec:

The World of Warcraft Armory

I use it on Freya, Thorim and Razorscale.

Top dmg on last Thorim kill:

Unfortunately (at least from the perspective of a person trying to incorporate Thrown Spec), my BiS weapons are not CQC. I have Malice and Remorse, the two Ulduar swords. So I have to take the Endurance point.

I think what I'm going to do is take only one point in Weapon Expertise, get the lost expertise back through itemization (Thrusting Bands for Sinner's Bindings) and then reallocate the point to Thrown Spec. I considered incorporating the Concealment Shoulderpads (which have a large expertise bonus) but the other gear juggling I would have to do just required too much dps sacrifice.

By also adding a glyph of FoK just for this fight (and then reverting to KS glyph), I hope to have a nice specialized spec for Thorim.

Thanks for the tips.

I've been really enjoying the dual spec feature and I was wondering if anyone has a different opinion on which spec to use for which fight. In my experience these have been the better choices for me so far:

Razorscale: Combat
BF+KS and AR+FoK on adds really boosts your numbers in this fight

Ignis: Mutilate
Single target, basic rotation, murderable, nothing special about this fight that would make good use of Combat's cooldowns.

XT-002: Combat
Blowing all cooldowns on Heart

Kologarn: Combat
Stacking every cooldown with BF (you can hit arms+body from 1 position)

Iron Council: Depends on if your tanks are making good use of Rune of Power, if they are then Combat (Cooldowns+Rune of Power), else Mutilate.

Auriaya: Combat
When there are adds: BF+KS, AR+FoK, dps will skyrocket. Using KS to get avoid getting feared so you can continue dps is nice too (combined with KS glyph).

Hodir: Not sure about this one yet

Thorim: Combat
Lots of adds, same as Auriaya, and since most damage is by FoK in this fight I have been using Daschal's Bite instead of Webbed Death in Off-hand.

Freya: Not sure

Mimiron: Combat
BF+KS+AR is nice in last phase.

Other bosses I haven't done yet in 25 man. It seems to me so far that Combat shines when you know you can use Blade Flurry in a good way to hit multiple targets and maximizing your dps in those 15 seconds.

Very nice list, HENNESSY.

From my experiences, I believe Combat works really well for Freya since most of our damage comes from Fan of Knives.
For Hodir, I believe Mutilate is the way to go. No adds, just single target like Ignis.

Last I checked these were immune to AOE, BF and KS

Also, could someone perhaps edit the trinket list to include the 25 Yogg drop; [Blood of the Old God]