Armour is very low mate, are you using both armour passives and have the enchantress 15% armor buff?
Resistances are waaay more than adequate, hp is fine, block ammount for these mobs are fine, but the block chance is pretty low (justice lantern/helm of command are amazing)
Also, since 1.0.3, i suggest farming elite packs rather than boss runs now, bosses give 1 guaranteed yellow per 5 stacks now, but so do elite packs. I've been tearing through act 2 elites all day and have found this to yield waaaaay more yellows than doing a 5 stack kulle -> belial run.