It's helpful to use multitarget moves, especially ones that hit the doll summons weaknesses, on the Alice fight. I really don't remember, although I think Wind and Cold were good... otherwise, if you've got someone like Hina to blanket debuff everything, that might make it pretty easy too.
There's some main equips (and eventually one sub equip) to boost MP regen. Kaguya definitely needs at least one more point. With that and her passive to increase back row regen, she's awesome.
Yuugi... hrm, I didn't have trouble with that fight. She just blasts out one person at a time, right? Damage rush it. Blast her with all the magic and other various moves you've got. She's an FOE instead of a proper boss, right? That'd mean you can overlevel for her, too, if needed. edit:Wiki says she's weak to Wind, Mystic, Spirit, and poison.