You can have two specs and if you are dying in regular ToC10 Northrend Beasts, you're not using your cooldowns properly.
Fixing your gems would also help you stay alive.
Griff's Rules of thumb:
Don't gem for defense if you are over 540.
Don't use blue-quality gems when epix are available.
Don't worry about socket bonuses unless they are ~+10 or better.
As for your gear -- to much block gear, look to upgrade pieces that are itemized with both block rating and block value especially.
Get yourself a Black Heart trinket.
For your spec - move 2 points out of cruelty and pick up 5/5 deflection.
I'd also try a glyph of sunder instead of barbaric insults.