I'm guessing zerging is impossible without the gloves. So far, I've reached 36% on Inquisitor as my best attempt, but I usually die around 40-44%, or something like 19-23m damage done to him. I've only had one death where I was knocked off, but that was largely due to drawing the fight out.
I gave Indomitable a try, and it makes surviving phase 1 substantially easier (rolling with 7.1m+ HP), especially when not running Impending Victory--which I see so many people do this with. I find it doesn't provide enough healing, ever. To that end, best attempt with it was like 22m damage done, so it was pretty much on par with Devastator, just taking a bit longer.
Mind Rend is still death, and the RNG that comes with it is absolutely stupid and cannot be manipulated. He will cast Drain Life from the second cast, or as late as 8-9 stacks of his Aura. This makes planning the first phase impossible, and why I can't seem to do much. I don't have enough interrupts to weather his casts, and never enough mobs to stay alive. He just pelts me for 2.5m a cast, and Ignore Pain mostly just takes the sting out.
The real great wall to this is the Aura stacks vs. Drain Life. Since I'm not an engineer or a blood elf, I've got a single ranged interrupt. Drain Life comes randomly, and more often than Storm Bolt is up, and seemingly never when I'm actually gaining stacks. As a result, I have to burn an orb to stop him safely, and those run out pretty quick.
Does this trigger him to Drain Life more often, or does he just stand there? It would seem a little easy to just stand out and heal up before going back in to nuke him with Battle Cry again.