Uncrushable I am with Holy shield up, this is true, which is why most of what I'm going for it +stamina and threat generation.
I want to go with Stealweave over something else like +Agl on the cloak as that provides all around better pure mitigation. (Miss, Dodge, and Parry) Once your uncrushable the idea is to improve your threat generation while reducing the chance of getting damaged at all without hurting aforementioned threat generation. Oh and stamina. Never can have enough of it.