Many thanks for all the answers, you all have been a big help.

So I'm getting my girls leveled up and try this CC thing, don't know how that works exactly, I guess I need some units with the right amount of stars and the right class and a fairy of the right metal?

Might try that with Katie, I didn't reach level 50 with any unit yet and I might have given more exp to Cypria than these guides adviced, but she worked so well, whatever.

I also had two pulls at the shrine and both gave me archers, I guess I will use Fuuka instead of Soma then.