Is it pizza wheel tiny pin marks, or paper feeder rubber rollers? If any parts in the printer get ink on them, they can certainly transfer it to paper as it passes thru. Humidity can effect how the paper works, and excessive humidity can cause paper to bow and/or wave. You always want paper edges and corners to be as plat as possible to avoid the print head from rubbing, or other jamming issues.
Have you cleaned parts inside the printer? Have you raised the platen gap?
While I know quite a bit about different Epson printer models, I'm not a certified tech, and don't officially support printer issues, so Epson may be better suited to help with this issue.
Best regards~ Dana