@P2:
Healing roles are divided here. While the add is alive SCH focuses on OT, WHM on MT, PET on raid heals. Add dies, both SCH and WHM are free for flatten, then Med II and Succor before megaflare finishes casting. This is the best time WHM can use Med II because the tick will fall off before the next add spawns, otherwise its not mandatory if you wanna save mp— just make sure everyone is topped off for megaflare damage.

Tricky part: Megaflare+tower on stack point
For this one get ready to time your Cure III after megaflare damage so the marked people will have the hp to soak the tower. That means during megaflare, WHM takes care of the raid while the SCH makes sure MT is alive.

Topping people off for before RoB:
This is where I usually pop my Divine Seal cos I wanna be cheap and just Medica instead of Cure III.