Hammer Time! (redux)

Ulu got his Hamma last night, and with it he broke 400 Spelldamage in his main tank gear (with 15k health and 17k armor to boot).

I'm considering replacing a lot of Ulu's hybrid gems with pure Stamina gems, in defiance of my earlier theory. I may need to secure a couple of alternate sources of Defense before I do this, but the net result should be a profound increase in his health (I've estimated an increase to around 15.5k unbuffed).