Hopefully you're not pugging it so you can synch well with (hopefully) you're SCH healing partner. When people group up for the jump, pre-cast a Cure III right before he lands so you can top everyone off and spread out. Always be cognizant of what move is about to come up so you can adjust your heal. Before stomps I always pop a Divine Seal + Quickcast + Medica II, and if people need to be topped off I cast a Medica. The SCH will be healing too, so don't feel like you have to do everything.
I generally pop SoS at the end of every jump to keep threat low. Keep regen on the tanks and pop a Medica II when you can so the aoe damage wont' be as much of an emergency as healing the tanks. Save benediction for the MT. A tableflip on 2 stacks in the last phase, followed by a punch is a TON of damage, so Benediction will keep them safe if needed. Don't finish a heal if it means you're going to be hit by WotL. Your death isn't worth it.
