You are at 24 expertise... need to bump that up to 26 for the soft cap. However, you are way over the hit cap, which is not even terribly important to you since you use mostly spell damage to tank.
You can still use a couple of upgrades from HToC 5man, but after that you pretty much need to get out and do 10/25man instances for gear and triumph badges. May have to find a raiding guild for that....
Buy the conquest badge bracers or run H OK for the bracers off the last boss (forget the name of them) to replace your blue.
Gem-wise, get rid of the +hit gems and dodge gems. Replace the hit gem with defence/stam in your chest and socket stam for anything else.
Enchant: May want to consider +275 hp to chest instead of +10 stats, and definitely get +22 stam to boots as well as +40stam to bracer.