There are entire books on RFI. IN fact, the ARRL sells at least one at the arrl store (
www.arrl.org and follow the STORE link)
This seems to be a "luck of the draw" issue. I have a PD-9180 with wizard and a Kenwood TS-2000.. I know of a few other hams who have more or less the same thing... They complain about RFI from their PD converter... Me. If I'm listening to my Kenwood, and the breaker trips.... The lights dim, that's the only way I know the breaker tripped. No change in the sound at all, ZERO interference 160 meters to 70cm that I'm able to find (in fact I go all the way to AM broadcast on the long end) ZIP.
And as I said, the others have the same converter, same batteries, same radio, same, same, same.
Check the chassis ground on both the converter's case and the radio.. All I can think of is mine is well grounded.