Mastery is Low, parry is high. you want to keep the parry chance only slightly higer than the Dodge chance, as the rating for both have Diminishing Returns; the the more of a rating you the less benefit the next rating bgets you, think of it as the first rating buys you 1% the second rating buys you 0.5% the third rating buys you 0,25%, etc. thats massively exaggerated, but you really want to have your parry chance around 1% ahead of your dodge chance.
you should reforge so that every peice has Mastery on it. even if this means reforging Dodge or parry to mastery (in your case it should alot of parry being reforeged to mastery).
Pick up heavy repercussions, its probably our second best threat talent. drop gag order for it.