Drum perfect struggling with cubasis

Hi, I’m getting real bad crackling and distortion when driving dpp from cubasis over virtual midi (ch10). It’s fine when I have dpp screen up but as soon as I flip to cubasis it can’t handle it, cpu is on 33% (iPad Pro 2017).
I know that there’s a dpp bug when using it as iaa with cubasis but I’m pretty sure it used to work ok over virtual midi.
Thanks
I know that there’s a dpp bug when using it as iaa with cubasis but I’m pretty sure it used to work ok over virtual midi.
Thanks