it's really one of those things that isn't worth quibbling over all that much anyways...the bounce is still intact in all of Mai's sprite animations and is only removed in her idle stance animation, never really made much difference to me since you can still enable blood through the Dips...now THAT was more important to me personally...
on the pcb version just hit down the dip switch 3 before you start and it turns the board into japanese and then you get the bounce too, and it defo does work