There's no great fix for this, you may have hit a mixed set of balls. Reballs work reasonably well, however, if you're using mighty balls or one of the other knockoff brands you can run into issues. My fix was an Evolution II- Without having a force feed or anything for the balls to squish on I had some great rof's and very few issues.
'07 Angel G7 Joy Division
'05 Dye DMC /w X94 bolt
'05 WGP Black Magic /w MQ2
'03 Dye Matrix /w X93 bolt
'01 Shocker Sport Turbo /w old school Maxflo 4500