PvP gear has no mp5. I also prefer the t4 helm to the ZA one since it has a meta gem. Also what is up with the neck, ew.
You need to run Kara and replace a lot of that gear, mainly pve. Legplates of the innocent, t4 chest, t4 shoulders (you have ret shoulders s1, bad times). Your Spellcrit is ho hum, your Mp5 is atrocious. 1900+ healing is nice but if you don't have the mana regen stats to back it up you are gimping yourself.
Try to get mp5 back up to 100 while casting, unbuffed. Spell crit isn't horrible so if it goes down .5 a percent or goes up, not a problem. Really start looking at Kara and what you need, start trying to find Gruul and Mag pugs and replace PvP gear.
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Bode - 100 Holy Paladin - Lightbringer