I don't really feel comfortable using shield block on boss fights, but I thought that was what I was stacking mastery for. Now when I use shield barrier I feel like it actually does something, especially on the Blade Lord fight since I get such an insane amount of vengeance from him that I can get almost 160k shield barriers. Since shield barrier scales with your AP and Stam should I just stack stamina, while maintaining an equal amount of parry/dodge. I've also seen on Blade Lord that one of my blocks (maybe a critical) blocked out like 40k damage off of one of his white hits. But then I can get a normal shield barrier for the same rage for like 54k with no vengeance.
So long story short... Wut do
Also is Blade Lord like a gear check for tanks? Or is it that I have to be really smart with cycling my cools downs for his Overwhelming Assaults?
Ninja edit: My Hit/Exp caps are top priority right?