Basically, you're still gearing for Wrath tanking and it's wrong for Cata.
A) No PvP gear - unless it's just loaded with mastery and several steps above what else you have, it's a lot of wasted rating. Res is useless for PvE now.
B) Check out the primer in my sig for why, but gemming sub-hard mode raiding is:
Yellow = Mastery
Prismatic = Mastery
DPS Socket Bonus = Mastery
Blue = Mastery/Stam
Red = Parry/Mastery
C) Every piece of gear should have mastery on it - if it doesn't reforge to it.
D) Outside of a very specific case in hard modes (basically raid DPS is right at the enrage timer so you need DPS to go faster sooner) hit/exp is of little value. Taunt/Interrupts don't miss anymore. Exp = 2x hit for threat.
I'd encourage you to read the primer, at least the sections on gearing and gemming, to understand why - but sub-hard modes, WarTanking is all about the mastery.