Respec for my priest.

[vor_lord]

I think Xanthix was suggesting holy spec, because it improves the chance of getting critical heals.  Basically, it's a way to give +5% chance to crit on all those flash heals you've been casting.
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Aha! I've seen this question asked elsewhere but not answered (that holy spec increases heal crit chance). So that definitely seems worth it, better than improved renew, especially for a flash healer (crit on a greater heal seems like a waste).

Thank you both for your advice.