I've had the same problem. I checked the Minimize Margins and it centered. Good luck.
Here's how I center a print image in PS on my PC:
In PS, select paper size and orientation with Page Setup.
In PS Print, check the Center box.
In Epson 2200 driver, check the Maximize and Center boxes.
When the preview shows up, make sure the image is centered. I find this to be the only good use of preview