Ah, well I know that at this point with ninja hate is a very fickle thing.
I'm at the point you're at also, The only real solution to the problem is to get a partner, and get your partner to work in rotations of the ichi wheel with you (switch off between who does which spell).
Of course me and my static partner have known each other for a good time now, so it was really easy to deal with. We never lost hate.
If you can't get a partner make sure your using your enfeebles well, and use a high breath mantle like everyone else is suggesting.
Of course it doesn't really work when you do more damage than your partner on regular basis
