In addition to what Keten has already mentioned about your hit and expertise, your gemming is atrocious. You appear to be beyond the point where haste-biased gemming becomes more valuable than strength-biased (can't confirm at the moment; simming other things). The real problem with your gems, though, is that you don't seem to have any bias.
A strength-biased gem setup uses Bold red gems in red sockets and prismatic sockets, Fierce (strength/haste) orange gems in yellows, and Etched (strength/hit) purple gems in blues. A haste-biased setup uses Fierce oranges in red sockets, Quick yellows in both yellow and prismatic sockets, and Lightning (haste/hit) green in blues.
That's not going to be a miracle fix, though; Keten also mentioned you're using a semi-strict rotation where you should be using a simple priority system. Look into using CLCRet until you become more familiar with the current system. Also, Judgment first - always. You're using Long Arm, so Judgment will get you into melee range faster, start stacking Censure immediately, and give you Holy Power before anything else.
Only other thing really holding you back is your weapon enchant (don't worry about it, though, as new weapons are readily available in the new raid) and a lack of your 4pT14. A fellow Ret broke his 4pT14 and saw a noticeable DPS loss, despite the new piece being 16 item levels higher; I suggested he go back to the 4p, and his DPS went back up to where it had been. So far, we've been really lucky with set bonuses - some of the best of any this expansion. They really do help.
EDIT: Just simmed stat weights for you - haste-biased gemming is the way to go, but by a slim margin; typically anything between .45~.5+ is when haste becomes superior. And weights are as follows.
Strength - 3.51 (1.00)
Hit - 3.44 (.98)
Expertise - 2.48 (.71)
Haste - 1.6 (.46)
Crit - 1.21 (.35)
Mastery - 1.16 (.33)
Edited by Grôgnárd on 3/15/2013 3:57 PM PDT