904 Downshift Squall or Howl

At this point, just about any idea is a good idea. We have been adjusting the rear prop valve out as we improve the brakes; it may be all out by now as we put in higher CoF front pads and adjusted more prop valve reduction back out of the rears; my goals is to get trid of that thing. But it does indeed sounds sorta like old school bus brakes LOL!