Try running it on a heaver paper setting. It will slow the machine down and increase the charge. Also try a different paper stock if you haven't already. Coating can play a factor in it as well.
If its a kind of blotchy pattern on built colors on the lead or trail edge of the sheet it could be the charge on your second transfer roller. If you have the expert process adjustments enabled you can adjust the lead or trail edge under paper settings for that tray and click on Process Adj...
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