Yeah that's darn low. Lets's see what we can do here. Now, I haven't played this guy in MoP so take what I say with a grain of salt. Here goes:
Talents: Most of them dont affect dps, but there are two that I would personally change.
Most people, including myself, take Long Arm of the Law because in instances we're almost constantly in combat and almost constantly judging. Pursuit of Justice also causes spikes in speed, which can be weird, and encourages you to hold onto holy power. But, again, not a big dps difference. The only thing I can see is that you would be able to sprint to mobs and get in dps range faster.
The rest are OK if that's what you prefer, except for Sanctified Wrath. This isnt a bad talent, but if you feel that you are bursting and then are worthless, picking up diving purpose can help. Sanctified Wrath will be better in a raid environment when you get the 4pc t14 for ret.
Stats: Not seeing any reforges. I believe priority goes something like this:
STR>hit/exp to cap>haste>mastery>crit
With the new Sanctity of Battle, haste is now an amazing stat for us. It does everything!
We get more seal of truth ticks, faster weapon swings = more art of war exo procs, but the most important part is lower cooldowns on all of our core abilities.
So you're still gearing, and that's ok. Ret is more gear dependent than a warlock, so your dps will most likely be lower. But should be able to get more than 16-17k by pressing the right buttons at the right time. What is your rotation for both single target and AoE?
Single Target should follow the priority system of
Hammer of Wrath>EXO>Crusader Strike>Judgement
And use Templar's Verdict when you either can't generate any more Holy Power because your abilities are on CD, or you are at 5 holy Power already.
AoE is basically the single target rotation, but keep hammer of the righteous on cooldown and use Divine Storm when you can, providing that you can't use Hammer of the Righteous and gain more holy power.
It's important to know that using divine storm becomes more efficient that Templar's Verdict on only 2 targets. Only use Templar's Verdict for a single target. Divine storm also bypasses armor, unlike Templar's Verdict, causing the effect to be even more drastic on some mobs.
Even when AoEing, It is usually more beneficial to use seal of truth. Seal of Righteousness is pretty weak, and only surpasses SoT when more than 8 targets are present.
The final piece is making good use of Inquisition. It should be up at all times during combat. Most people use an add-on like Weakauras to help them keep track of this important buff. When to cast it again is best left to your own judgement(not the spell). Don't cut it off too short if you can wait use another ability and then refresh it a few seconds later, before it drops off. At the same time though, Dpsing without it is more than a 30% dps loss( its also a loss of 10% crit)
The only other thing I can think of is to fill in your third glyph slot, either with Mass Exorcism, or Double Jeopardy.
I hope this helps for now.
Edited by Arte on 10/4/2012 1:54 PM PDT