how to address overhealing
I've raided with this group for a while now and none of the healers in raid are particularly inclined to snipe heal most nights. We also don't run with multiple hpriests or mistweavers so I can't immediately compare, but if I ever see similar healers in the second half of MV in LFR I never see them doing that much overhealing either, it's always in the neighborhood of 10-40% depending on other healers.
Breakdown of heals, buff/debuff uptimes seem okay, and no particular heal of theirs is doing a lot of overhealing. Is there anything else I can look at to figure out what is going on with those two? I don't think this is just an inevitability of their spec.