Did it twice without too much headache.

Team 1: Shingen, Baal(U), Tyr, Raiko, Dian. Saved all potions. 6 single + 2 team. Burst damage/abilities up to rage bar. Use Tyr's abilities to hit 2M putting her into stun, finish her off.

Team 2: Andromeda, Mammon, Tyr, Raiko, Dian. Saved all potions 8 single + 2 team. Using Andromedas Thunder Staff Planet Star + Pure Garden to increase healing.

Use support Kirin for resistance to afflictions, for 2 turns 3/5 of my girls avoided debuffs.
Dian creating 4-6 extra potions before facing Jack is super nice.

Team 2 took several 4-6k AoEs to the face compared to only 1 time of Team 1. Luck, RNG, Damage trigger? I dunno

Either way its a race to the finish, even with the massive healing/cleansing of team 2 I would of eventually died.
Never waited for full burst, just did it when anyone had it up.