I don't know if anyone will still look at this, but I figure I'll just post what I know anyway.
I've Doc'd Tank team for both Tiger and Turtle raid.
Tiger raid is actually a piece of cake compared to turtle, and I believe as long as the tank has got everything right (build, armor, what have you), they can get buy without losing a single scape. I usually spam Regen 11 (only for tank), First Aid, and Frog Soup then the AoE heals should anyone else in the team need healing too.
Then if possible, it is ideal to have Choking Climber subbed as well and use it whenever you can but stay close to the tank as possible and use it when the majority of the mob is in place so the skill can grab most if not all of the mob.
Turtle really throws me for a loop, though. Either it just seems to me like the mob is larger, or because those turtles might have some nasty magic attacks that just break down the tank constantly so they tend to lose a bunch of scapes no matter how fast you can pull a buff, so that probably needs more investigating.
Usually after tank loses a scape I go right for Frog Forcefield first. I'm still not sure about if the mob has magic attack so I only guess that a high lvl Yang Frog might help? Most of the time I go FFF then Prolong. Not that it might really matter, but I always figure Lvl 11 FFF and Prolong might cast faster than lvl 10 because I click the hotkey right away to cast instead of me clicking it then having to select the tank to cast it on him/her.
I've always been iffy about Ultimate, but if there are 2 docs on the team I guess it would be nice for 1 of them to have it.
I've known Sylpha to use Mega Medicine for our tank Liah when we've done Madam Malachite raid. I can only guess it worked out well but I wasn't in the tank team at the time. However like Ultimate, using it takes a long time to cooldown so I'm not sure if it is consistently worth it to use. I figure though, that as long as you are on the ball and healing the tank all the time, having those 25 seconds of "invincibility" wouldn't matter, as long as you can Choke once in a while.