Start off the fight popping DW/Reck on first CS. When Reck falls you utilize the Apparatus. Apparatus will be up for the remainder of DW and have sufficient stacks because Reck was used.

Yes you'll primarily be delaying future Apparatus to tie in with DW, but you shouldn't macro them together because sometimes you'll utilize Reck first.

From 4.3 PTR Patch Notes. Can't say we didn't expect this coming.

You're missing this part though :

Fury
Unshackled Fury now increases the benefit of abilities that cause or require you to be enraged by 44.8%, up from 11,2%.
Dual Wield Specialization no longer increases all Physical damage by 5%.

The unshackled fury buff must be an error, as this wasnt reported by blizzard and was datamined by mmochampion. Dont trust it.

This post assumes everyone knows about using a mastery set/trinket prepull to boost deathwish.

Engineers seemed to me to be at a disadvantage when it came to building a prepull mastery set, since it puts the synapse springs on a 30 second cd when gloves are equipped. I found a workaround though, which ends up being a decent dps boost for engineers. Kind of a pain in the ass to properly time:

Put synapse springs on your mastery set gloves. Pop the moonwell chalice ~22 seconds prior to pull, deathwish right before the mastery trinket buff falls. With the moonwell chalice buff gone, the mastery gloves' synapse springs will be off cd, so pop those, swap to your normal gear, then hope combat starts soon. You'll keep the synapse springs buff even when you switch the gloves, and your real gloves will only be on a 30 second cd.

Also, unrelated to engineers, and applicable to anyone with access to the weapons: I don't have the items to test this with, but I'd think that swapping to heroic Skullstealer Greataxes and a mastery ranged wep prior to the second/third/etc deathwish, then swapping back to better weapons would be a dps boost if you could time it right after your weapon swings.

It would be more beneficial if you have two Zoid, since Sulfuras or Skullstealers already have mastery.
With two Zoid and switching to two Skullstealer and Extreme-Impact Hole Puncher, it would be a gain of 711 mastery which means you'll add 4.4418% more bonus damage to your Death Wish (711/179.28*5.6/100*20).

But switching weapons also triggers a gcd and even though you can Death Wish out of gcd, you won't be able to keep your rotation if two gcd are triggered. And it would be even more chaotic if you only switch weapons after a swing occurs.

Im finding very little dps gain from using mastery set and deathwish prepull just because of getting completely rage starved and having to wait seconds for white swings to generate any rage (get a miss in the first 2 swings and your looking at 5-7 seconds of the deathwish with very little output, theres also a possibility this can mess with the second CS debuff falling partially outside the deathwish) compared to waiting a couple of seconds for rage and then getting full duration on deathwish.
Was wondering if other people are having this problem (admittedly i am running in a 10-man group that since i tried this has been without melee haste buff) and what they are doing to counter it.

Its not a full ICD but something around 30 seconds similar to the on use trinkets.

Spamming Battle Shout and Berserker rage for a little over 2 minutes before the pull, will make you start the fight at 100 rage. And if you have "left-over" rage from trash, it will be even easier.

Most people roll with 1/2 BV, as it lines up really well with every other CS.

Which value is considered for the attack table: Expertise (e.g. 26) or the Expertise Rating (e.g. 781)?

I am playing a human TG warrior, using swords. That is, I only need an Expertise of 23 with a rating of 691. As I currently have an Expertise of 25 with a rating of 689, I ask myself if it is worth to invest two more rating points?

If I could not reach the cap and if Expertise (and therefore not the rating) is used in the attack table, wouldn't it be wise to get rid of the now superfluous 28 rating points down to 661, staying at 6.25%?

Using reforging, I could reach the cap as follows: I could replace 78 Crit. with 78 Exp. and 74 Exp. with 74 Hit. This way, I would be over the Exp. cap with a rating of 2 points. If I use Landsoul's DPS values for stats, I would approximately loose 21 DPS for reaching the cap. (-78 Exp. * 2.3433 DPS + 2 Exp. * 2.1009 DPS + 74 Hit * 2.1337 DPS = -20.6818 DPS)

Missing 0.25% of Exp. equals to missing every 400th hit (mathematically) - is this correct? Considering only white damage, the 21 DPS loss would result in -28,467 damage (= -21 DPS * 3.39 weapon speed * 400 white hits). Causing 1,584 white DPS with my weapons, even if I would crit, I could of course not reach the 28.4k DPS.

Is my reasoning correct, that in my case it makes no sense to reach the Exp. cap?