Jim,
You beat me to it
It's a matter of disabling printer expansion/over-spray and entering negative page margin values to correct the printer paper feed errors, assuming they are consistent.
When you have got this fine tuned again, save it as a Printer Set up for easy retrieval of all the settings. I have one for 6x4 Epson paper and one for 5x7 Ilford paper, both borderless.
Terry