I too have noticed a TPS drop since 3.2 came out.
Since you asked I'll give ya what I know or have made myself fimiliar with:
Never gem for parry not until you are about 2:1 parry over dodge (1.88:1) is the actual number but even at your gear lvl you aren't there. So stick w/dodge as it still diminishes slower and is more bang for the buck.
Maybe some of the treat issues are in the build. You are in a SotP build and no reckoning which is limiting your threat. Going to a conviction/crusade might add some of that threat you are losing.
As for the Mana issue, you have 2/2 in SA and 1/5 in benediction so that shouldn't be problems in raids really. Less on the concercrate and judge mana might help. Keeping Divine plea going is also a must.
Last note, remember that SotP is a flat 15% damage on judgement where as conviction/Crusade help group DPS and add to your threat by crits on melee and most spells which is a 200% attack.
I see you gemmed str already, which is our #1 threat stat and will only get better in 3.2.2. Keep is my advice.
Hope this helps, cause I didn't know where you were going w/the questions.
I use this build for a threat oriented build. The points i've spent in Imp HoJ are solely based on my playstyle and could be placed almost anywhere else you wanted. I do not recommend Divinity because it just doesn't perform. If you don't like the Imp HoJ option, i would suggest putting them in DivSac and Divine Guardian I assume you're using SoV seeing as how you use that glyph.
One thing that you didn't tell us is what kind of trash you are going oom on? Is it all AoE trash packs, single target pulls, or is it really all trash? I find that i use slightly more of my mana on single target pulls mostly because they tend to be bigger slower hitting mobs and BoSanctuary isn't providing as much mana back. My raid leader and i will often leapfrog each other on trash packs and call one of the healers forward to keep us alive while the dps kill the last pack, this helps to ensure that i keep Divine Plea up most of the time and also that i'm constantly procing BoSanctuary.