I'm in the process of calibrating for my Pl/Pd workflow and am getting marks on the Pictorico Ultra Premium OHP film. I've read about a lot of issues with star wheel marks on other Epson printer models but don't seem to find much about the star wheel fix on the 4900. IS it only when using sheet fed film? Can I avoid the problem by using roll film instead? Is there a work around for the marks? Thanks.