Xerox Driver Phaser 8400 (x32 - X64) Issue

I have 2 new computers using Windows 7 (laptop x32 and Quadcore x64). Installing web-based drivers for my 2 Xerox Phaser 8400 DP network printers is ok, but prints are not.

First after installation it only prints in basic b/w mode and not 100% the size (about 70%) of the original. It is like the printer uses A5 size standard and resizes everything accordingly. No paper size selection and/or print quality selection is possible. Now it seems I have to manualy set the configuration in the Xerox driver screen to Phaser 8400, and that solves the problem with print quality. I can now print in color also. But not in the right size or other paper types.

Xerox says only to help (level 2) if I have a service contract. I do not need this contract (no issues ever with the printer ever I could not resolve myself)) and do not want to pay for issues Xerox should resolve anyway...