1. Have the rear wheel dish checked, and corrected if necessary.
2. With the rear wheel properly dished, install centered between the stays.
3. Align the derailleur hanger against the properly dished rear wheel.
If noise continues, also consider that the wheel may be a tad to far forward. On my Tommasini, once I adjusted the dropout adjusters and allowed the wheel to slide back 2-3 millimeters, the slight drive train noise I had disappeared. Others will probably suggest the "b" screw adjustment...
All of the above assume that you're telling the truth about the cassette, chain and derailleur condition...
=8-)
__________________
5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life