Have you tried eliminating the ground on the power cable? PS Audio has a removeable ground pin if has been made in the past 7 or so years. Otherwise Elizabeth is right the folks at PS Audio are nice people to deal with, it's Boulder man....celestial teas..etc.:)
Power cable affects interconnect.
My PS Audio statement power cord makes my Kimber Kable KCAG interconnects from my phono preamp hum. I have to move the interconnects as far away as possible by tying them up to a fixture. There is still hum. I have had to move the phono preamp to the top shelf and CD player to lower one. I thought a good power cable would be shielded good enough for this not to happen.