The part of Turboprint I use the most is the Graphics Publisher. I love the way it reads the file data to print at the highest possible resolution as opposed to dumping screen graphics. How do you manage without this?
I'm not sure what exactly is going wrong with your setup but I know that some printers have an internal limitation as to where they can print for mechanical reasons. Could you be losing part of the print because the laser simply won't go there?
Epson printers have weird unprintable areas - it's like 0.32cm for the left, 0.34cm for the right, 1.1 for the top or something like that.
Also, Line Feeds might be put into the data flow if your page sizes are set at DIN A4 which will prematurely end a U.S. page.
Graphics printing is set to Bounded right? Not Absolute or Pixels?