For the mains I use
Recovery boost for Alpinia and Kerria.
Taunt for Saffron
Atk up first turn for trigger squad
Speed adjustments as necessary

For Whale I use ATK up first turn for everyone not on team 1

For nations I use Recovery boost for all that have life steal and Defense and/or speed adjustments on most of the rest

Recovery boost is worth it. I don't have or plan to get the Critical up anytime soon until all girls on all teams are leveled up on the rest.