Multiple Trill Playback at Once

Hi all, I'm working on a cadenza-like passage and it has trills/tremolos in the left and right hands at the same time. I notice the playback wonks out at a certain point, and if there's anyway to fix this. This is just an issue with playback. I already tried deleting the tied notes, and also replacing all the trills with tremolos, but it always has the same issue.

Is this fixable? Attached is the excerpt (starts at measure 6). Like I said, it's a cadenza so all of the time signatures and barlines are going to be made invisible.