Looks alright, what you want is getting 102,4% CTC (dodge+parry+block+miss) and stacking stamina after that. You're currently at 98% unbuffed which would be around 100% with buffs & food. So get a bit more mastery for the last 2,4% and then go for more stamina.
Easy upgrades would be the cloak, helm and shield from 5mans, vp neck/belt and some epic gems in the 397 you won't replace any time soon. I see that you've killed hc Morchok. Get the 4piece T13, doing hc modes without it is just gimping your raid, healers will love you for it