Gear: Get a meta. Pretty sure you want Eternal (+Block) until you're "unhittable" when it's ok to switch to Austere. You're a JC. Fractured Chimaira Eyes x3 - GOGOGO! There's a couple socket bonuses not worth shooting for (Belt, gloves, shoulders). Grab a shoulder enchant (Just the lesser unbreakable quartz - Therazane - revered rep. If you're exalted, keep the big one around for when you get a monster shoulder upgrade when you go get the small one). Change your boot enchant to Lavawalker (Mastery/movement speed). Also, the DPS pieces are kinda sketchy (Neck, troll ring, belt). Sure the item level is an upgrade, but do they help you survive? Also, despite the drop in item level, I'd replace the +Stam trinket with the King of Boars 346 JC trinket. You get +285 mastery (AKA block) plus a burst button for burn phases. 1900 Extra strength is always pretty, even if you're tanking. Unless you have access to much better pieces, like Mirror of Broken Images (Tol Barad - Exalted), or have done a TON of questing for Molten Front. If you've done no molten front work, HOP TO IT! It takes 300 marks to open the whole thing up, and that's just what I've seen of it, but there's some amazing gear available once it's all done not to mention the gold from all the daily quests.
Drop gag order, Imp revenge, and top off Deep Wounds.
Not sure about the double-glyphed clap, but I like the idea of glyphing scary shout to prevent fear-pulls.
Stuff to keep in mind in troll heroics:
Just because you're wearing pretty gear doesn't mean you get to faceroll through. Play smart. Assign CC, and mark kill priority. Also in ZA, the bear trash mobs (literally, the bears) have an ability called Crunch Armor that's a -20k (Yes, twenty thousand) armor debuff. Since you don't have full CTC yet, you're gonna take a few normal hits. If this debuff is up, it's gonna HURT.
Was there anything SPECIFIC in the troll heroics that was roflstomping you other than potentially bear trash in ZA?
Stuff to keep in mind in general:
In Cataclysm, your aim is 102.4% total avoidance (5% miss, dodge, parry, and block). Warriors don't see this until they're farming current (t12) content, possibly heroic t12. You'll have to ask a warrior player about that, as my tank's a DK. Anyway, we see plenty of stamina from gear/gems/enchants (head and shoulders) to avoid stam-stacking like we did in ICC.
I'm way better at holding my liquor than a panda.