Avoid stam stacking until you get the rest of your stats where they need to be (stam stacking without the right stats elsewhere means more work for the healer and the same end result). Increase your dodge, hit, and expertise... you have some nice gear though.
As for your spec, nothing really there that you could do to keep you from "dying"... not real sure why you chose to not include feral aggression or infected wounds... not being critical, just asking if there was a reason... I'm always open to making changes to improve.
Sorry I wasn't much help.. what little advice I was able to lend, I did so based on experience. Surely some uber bear tank will come along and teach us all!
I'm a bear tank and you're just jealous!