Seals of the Pure in Holy tree isn't really worth it.
Reckoning isn't really worth it.
Divinity isn't really worth it.
Divine Sacrifice is worth it for some OT situations, bad trash pulls etc, It's kind of an optional talent.
I'd move your Divinity talents into getting Divine Sacrifice and Divine Guardian .
Then if you took out the other talents i mentioned, you should have 13 left [D. Sac/ D Guard would be useful, and necessary for getting necessary prot talents to move on].
I'd use them on either Greater Blessing of Might [x2] or Improved Judgements [x1] / Greater Might [x1]*
Heart of the Crusader [x3],Vindication [x2], Pursuit of Justice [x2], Crusade [x3] and Conviction [x1]. This will increase your damage, and threat. I generally average between 1700 and 2200 dps.
* Many Paladins will say take Imp. Judgments because a 9 sec CD judgment is necessary for the 6969 spell rotation to work perfectly, imo it's better used on the improved BoM, as there are situations when there are no ret pallys there, and imo the 1 sec wait for judgment isn't a big deal, but my opinion is definitley the underdog here, do as you see fit for that question.
As for Enchants/ Gems, i'd use 22 Defense on your chest, basically more stats, though since you are D capped with no of-color gems, the health might be better, not a big deal. I would also do Armsman on your gauntlets. You might want to consider gemming for socket bonuses on +stam socket bonuses, you will get a little less stam probably, but you are wasting stats from the loss of the set bonus, Defense / Stam and Dodge / Stam add avoidance as well, and with the socket bonus of the stamina, you won't really lose that much stamina. Your dodge is very, very low, and your health is pretty high, so i would definitley try and get some more avoidance.
Overall you are pretty fine, you can do a lot more threat with a talent change though,
and you are a lil low on avoidance imo.