Through the printer panel you can do a media feed calibration. But if caldera is just overwriting all panel settings when it prints do this:
Go to the little wrench icon on the printer window in caldera. You will have three tabs at the top, printer, media, and status. On the media tab, you should have something that says "calibration value" or "feed adjustment". Do some tests with those settings.
Though, it could also just be crappy rollers on your printer.