you have 3% hit right now, you need to be at 8%
dont gem for crit, ever (unless the socket bonus is 6 or more strength, then use a +10 str +10 crit)
here are some items judging by your current gear, that you have the ability to get that would help.
Hellscreams Gauntlets of Conquest +52 hit
Bloodshed Band +44 hit
Greaves of Iron Intensity +56 - You havent done Iron Council 10 man yet, thats where these drop
Getting these items would put you at 244 hit, so your still a bit off, but it would be better.
other then that just follow your dps priority
expertise is the next thing to look at.. this is where it gets tricky.
Hellscream's Legplates of Conquest will help out a ton, they have 72 expertise on them, but cost 50 badges.
other then that most expertise gear comes from 25 mans.