next issue is to secure you collator or MBF.
if possible isolate the MBF so its mounted to the wall.
when the collator and MBF shake it causes flipped bullets also.
shaky work bench is also your enemy.
these dies are tight tolerence.
tumble brass for 1 hour and then lube, deprime all brass then tumble for 2 hours for final polish and clean pockets.
let us know how that works