I forgot to post what was causing our wrinkling. It was the cooling belt right after the fuser. They worked on our machine and had two techs try to solve it before blaming the stock, even though it was running fine on the other 7210 right next to it. We then tried 3 different brands of 70# gloss text and all wrinkled. They left and came back a few days later and at this point it had started wrinkling 100# gloss text, but just slightly. They talked to another tech who had been on a job with a similar problem and had found it was the cooling belt, so they replaced ours and problem solved. They said it appears they changed how it is designed compared to the 7100 series and while it is easier to change, it wears out quicker. The belt appeared fine, but was slipping and therefore turning too slow or unevenly.
