>>4464334
It's just that this damage should not matter, because your goal is to burst every phase, and be it with an OD3 and shooting with Bungo every single time. Because if you don't burst a full bar past the break, the enemy gets the shield back. This is BAD.
It's better to get there fast, and build the next OD while you are doing your current OD already. If you really lack damage, stats are likely the problem. Though what you do really lack is a buffer for bungo, that gives a turn based buff. Those are much more impactful than debuffs, and you have nothing like that.

It's a spam fight, and if you do it right (and have Karen + necessary LBs) you can actually beat this really fast, like 7-8 turns. Even deep into the ex fights, like pic related being ex+5, though that REALLY needs LBs, daphne, max soul and whatnot on anyone who wants to deal damage.
Though I wouldn't worry too much. They really designed this shit way too much around Karen. The fight is pretty much unfair if you don't have her. First time this game ever did that to this degree.