About Xerox WorkCentre 3220: This is NOT a PostScript emulation printer although its brochure stated so (PCL® 6 and PCL® 5e emulations, PDF 1.4, PostScript® 3™ compatibility).
I sincerely doubt this current drivers can help either because...
I had a scalable .eps file sent for testing before purchase. It printed a scalable line-art in half-tone dots instead of printer's native resolution. Upon raising the issue with their showroom demonstrators and later to their sales. They were baffled! The sales staff was outright rude. The sales manager promised to advise on my queries as to if they will ever be resolved, but promises unfulfilled for years.
Upon persistence, their backend technical support for other range of Xerox printers, confirmed that I was right. That their other PostScript and PostScript emulation printers print as expected, that is fine native printer's resolution.
So, if you are buying a Xerox WorkCentre 3220 for its PostScript capabilities, forget this. This is NOT a PostScript emulation printer.