With good healing I think you should be ok for most bosses, but you could improve a few things pretty easily.
1. You're about 1 heroic run away from Revered Argent Crusade, which will net you the head enchant and consequently 370 more hp.
2. Get 22 stam on your boots instead of 18.
3. Enchant your bracers, either 12 stam or 6 stats.
4. Enchant your cloak, armor or defense.
5. Fezzik's trinket isn't really much of a tanking item, do you have anything better?