I wonder if Xon's Imperil field would improve things. No Enemy side field to conflict with, and you could tag to Eithne's field to use those alongside other amps (Maybe Sylvie in place of Melissa if you have the Human Killer Card for Xon to steal) for a bit more burst damage on some other turns. With the damage it came down to for the 1 extra turn, it might add up over the fight.
Man the bosses on SSB are thicker than a woman with ass shots I'm loving it tho I'm trying to find a way to do some significant damage with my team and they are all ex2