My team is only around 66 (haven't played them in about a week due to RL... turning 30 requires a good amount of celebrating apparently) so I'm not sure how much passive healing really works.

What type of healing system are you using? Do you rely entirely on instant FoL and diving storm? Do you have all pallys cast their heal at once? How do you deal with some being on a GCD while others aren't? Just keep spamming the button?