Quoted from KingBW:
Following ... mine does bounce backs and diverter misses also. Maybe just lobby Joe and the software guys that when it's not in a multiball mode, just keep the diverter in place until another switch is triggered. Not sure why the switch would need to switch back so quickly to not still divert a bounce back from the diverter. Just an idea.
I had the same idea - longer coil hold - but the issue (I believe) is that the coils can't stay energized for too long without heating up, which causes problems of its own.