To get around this at the beginning of a fight I try to cast stoneskin on the tank before they grab the next group of mobs. It gives the tank more time to generate hate without taking damage I have to cure for. That way by the time I throw up regen it's not much of an issue and I can even help with damage on the trash mobs.

Just something you might suggest to your healer next time. Also yeah click off the buff if it happens to still be up before grabbing your next group of mobs.