Thanks everyone for your detective work on the printer issues.
I purchased the new epson 12x12 paper, which is truly 12x12 and printed 4sides borderless!!!!
YAY!!!!
BTW I had grumbled about my issues with epson tech support, but by the time they were through with me they had offered to send me a whole new printer if the issue didn't resolve after trying a couple of other their suggestions for fixes. I have to give them credit for that!
Again, thanks!