XP isn't the problem, because other then specific crashes that get fixed, and one rare problem that I can see coming miles away, my game never crashes. Maybe it's more related to video cards or processors or something. *Shrugs*
Anyway, the wiki team is a really BAD idea IMO.
Team 1 needs to have a tank, Sanae, Marisa, and two of Patch/Nitori/Satori. Well, not "needs", depending on the setup, but it's a good starting point. You want to hit elemental weaknesses on the three sisters using Marisa/Patch/Nitori/Satori, pretty much, while Tank does tank things and Sanae buffs offense stats/RES and heals and revives. For tanks; Sakuya can notably stop spellcard charges with Ayacommander+Private Square, and she can heal herself with Soul Sculpture, or Mokou can auto-life the whole party, or Alice can be GODTANK. Or, you could try tank!Nitori using Optical Camoflauge a lot, possibly with Satori Leaf Shield/Shield Wall/Starlight Barrier backup. Plenty of ways to do this.
Team 2 is everyone else, of course :V Youmu does craploads of damage with Weapon Bless/Dark Sword, using Human Realm stance and possibly using her Crit self-buff on turns she isn't using a spellcard. For said spellcard, decide yourself whether Paschal Moon Slash or Slash of Eternity is better, as I don't know. Alice/Reimu/Satori/Mokou/Nitori can all help keep your party alive, depending on who you have, so you have lots of choices. If you have the Kusanagi Sword, then Nitori or Sakuya or Mokou can all use that for nice support damage; so can Patchouli with Silent Selene.
There's lots of ways you can do it, especially with high levels like yours, and I don't know what the better ones are because I haven't tried too many yet :V I think I might try debuffing the first phase with Satori next, although I'd really like her in my second party as support. I'm trying to NOT have Alice tank the first phase, which is causing some complications... plus I need more damage to get past second phase without having to get a lucky Last Word off Sanae.