I use an Epson 2400 and have never had this problem on other papers. I am front loading this thick paper. There is a "bleed" of ink beyond one long 15 inch edge of my paper, like a smudge.
On my R1800, there is a much hidden "thick paper" setting in the print properties dialog, "maintenance" tab, "printer and option information" button at the bottom.
It's sticky, doesn't get saved or retrieved in custom settings and makes a popup appear at every printing when on , so it's very far from practical (epson software ingeneering at its best ), but it might solve your problem.
It did solve a "head strike" problem I had with Ilford Gold Fibre Silk (thick AND has a tendency to curl under heavy ink load), at least.
Otherwise, couldn't it help to clean the rolls?
Good luck!