I'd ditch everyone of those defense & dodge/stam gems in lieu of expertise/stam or straight stam. The ONLY socket bonus' worth pursuing are 9+ stam ones. Don't socket for avoidance, don't socket for defense unless you have to. Every wrath enchant gives more defense and sacrifices less stam then any gem.
You can optimize your EH better by enchanting 22 defense on your chest and the pvp enchant on your shoulders, then swap you meta-gem to the 2% armor 32 stam one. This should place you very close to the 540 cap, and afford you much more EH.
For threat:
Expertise > hit. Read
here. - I wouldn't socket hit gems anywhere. I would only socket expertise if you neeeeeeeeed to reach the softcap of 6.5%. However when it comes to threat, it's far more likely your rotation or heroic strike spam that is capping your threat rather then your gear.
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