nelths tear BIS on a pally..
maybe you should rethink how you play this game.
pallies have the most mana efficiency in the game with FoL spamming.
crit % buffs mana refunding and healing throughput.
ZHC should be #1 trinket as it boosts all your healing abilities for burst healing.
hibernation gem next patch is another to consider.
rejuv gem is BIS for every healing class.
considering that you have rejuv gem. you should consider getting an ON USE trinket for reactive healing scenarios.
if you don't have rejuv gem, use DM trinket/briarwood reed for +healing gain. if you need mp5 then go for the shard of scale. if you're going for a nelths tear as a holy pally, I dunno what to tell you aside from this. "please rethink how you play this game."

btw, do heals get resisted if you don't have enough spell hit?
oh right, they always land.. so why are you going for 2% spell hit then? and how is the spell damage from nelths tear considered highest over every other trinket in the game? are you that clueless of how healing works in MMO's?
cleanse botting - mp5 heavy trinkets
avg healing - +heal trinkets with some on use trinkets
intense healing - mix of everything +heal CD trinket to use during short bursts of raid damage.
also consider the haste trinket from BWL and how to combo that with holy light bursts during intense healing fights.
even in AQ40/Naxx, you will not have
ANY intense healing fights that
will require a nelths tear.... consider the other options and please rethink how you play this game.