If you use divine seal you should be just fine. Use cure and you will get that buff that will give you a cure II free. Unless the tank or one of the dps are at half health, then use cure II to get the up above 90%.
I keep stoneskin on my tank which saves me 2 or more casts of healing, and regen. Using regen on the party when Hp is down 1/4 of the way is great cause It don't use mp like cure and it works for 20 seconds.