Reading this again, there might be some confusion which rollers we’re talking about. There’s the sheet feed roller that grabs the paper in the top sheet feeder, and then there’s the transport rollers that are on rotating shafts across the width of the printer along the paper path. The top sheet feed roller is the one that is notorious for marking the print during the second pass for GO. Using the rear feed or a lead sheet will prevent that happening.
There have been reports of the transport rollers marking prints, but this was during single pass printing. IIRC the P800 had a reputation for this on softer papers like Platine when it first came out, allegedly due to spring pressure that was too high, but I haven’t seen any recent reports.
I don’t really see how either problem could be solved by reversing paper feed direction. I suspect that the your problem is the top sheet feed roller, and if so you may well find that the problem comes and goes. Sometimes you can get lucky and the roller doesn’t mark one print and then for no apparent reason it does mark another. If reversing the direction does provide a stable fix then perhaps you could let us know.