I'm aware of the damage that Rachel can deal but in a single combo, it's incredibly situational.
I really suggest going against the AI on Hell setting.
I mean, you've played it before, so it shouldn't be too hard to get back into the swing, despite the differences between CP and previous iterations.
Then fight more people at your level, that setting does exist within CP
Half health combos are finicky in BB. It ultimately depends on your opponent. Tsubaki, Rachel, Carl and Izayoi pray that they could get half health combos even with a Distortion option.
Just pick characters you feel...
It's fine for anything except Ranked. It's unfair on those who do invest into the game and it deters those who want to learn the mechanics of their character when they get repeatedly beaten by those in Stylish.
If you don't want to learn a new character and their mechanics then, of all...