William,
The difference in printers might be too great for my experience to be of use, but I have had trouble feeding canvas and other thick media through an Epson R1900. A tip which worked well was that, if the Epson printer driver is popping up on screen to complain of a jam or feed failure, do not 'okay' the warning message: go to the print queue and 'pause' the print job. On my printer, the printer clatters for 15-20 seconds before settling down and going quiet. Un-pausing the print job at this point will often cause the print job to continue normally.