If looking to gear for MT I would look more at an EH set and a TPS set. BV is kind of for trash and I don't see much point in it.
Looking at your gear it seems fine other then waiting for some BiS pieces to drop to replace your
Neck - Boundless Ambition - Item - World of Warcraft or Nexus War Champion Beads - Item - World of Warcraft
Legs - Legplates of Sovereignty - Item - World of Warcraft
and Belt - Ablative Chitin Girdle - Item - World of Warcraft
Beyond that you start to get into simply theory crafting what you consider more important things like hitting expertise hard cap & hit cap or getting as much health as possible.
You do need to get rid of any gems like that defense one in your belt, there are much better alternatives for staying def capped without gemming for avoidance.
If you decide to really go for the expertise hard cap you could also considering grabbing
Horn-Tipped Gauntlets - Item - World of Warcraft from heroic gundrak and socket with another 16expertise gem. Even if you don't I would switch one of those 24 stam gems with an 8 expertise/12 stam gem so that you get the socket bonus of another 6 stam so in effect you would have 8 expertise / 18 stam which would seem like a better alternative. An additional 8 expertise > 6 stam
Last thing you NEED to grab the best talent spec possible if you want to be effective. 15/5/51 > anything else
Talent Calculator - World of Warcraft
<3 ur dark moon card, I want one though I probably wouldn't use it for much besides Patch