Talking about crit team, how about this setup?
Shiro-chan (Dusty Miller)
Saboten
Ume
Loquat
Rainbow Rose (RG)
1.8x skill act, 80% crit chance, 185% crit damage with 335% for RR.
Can shift Loquat out for Himeshara as substitute member while cut skill act down to 1.6 and crit damage down by 25% in exchange of powerful sweeper (310% crit damage, has chance to double act so the team becomes hybrid crit/double act)