What printing-system and drivers are you useing (there are 2 in MOS)? PS via TurboPrint, or direct Postcript? In last case, what .ppd-driverfile do you use?

Your printer supports pdf-printing. What happens, if you copy your PDF directly to the printer? With certain pdfs, VPDF seems to have strange issues. You may also copy your pdf to a online pdf-converter (https://online2pdf.com/de/) and convert it pdf2pdf. In most cases VPDF will accept these pdf now.

Your printer is network capable - why are you useing USB instead of ethernet (netprinter.device)? If you do, you have access to the webinterface and all prefs of your printer via OWB.....