I have a pro audio PS and it is quiet on all HF bands with my KX2. However, I do not think I have used it with an antenna which starts in the immediate vicinity of the actual PS. Years ago I had some "noisy" SMPS's which were noisy with an end fed antenna which started right at the rig, within perhaps a foot or so of the PS, but were quieter when the antenna (inverted v etc coax fed) were many feet away. If you use an end fed antenna, try to use at least 6 to 10 feet of coax before the matching box, and use a good common mode choke on the coax, possibly part way toward the rig, experiment. If the RFI is entering the transceiver through the DC power cable, try 10 or 15 turns on a type 31 or 43 core. Also it is possible that the RFI is fed back into the AC line which radiates back toward your antenna. If the RFI is via the DC feed it is possible that it is not common mode transmission (differential mode), so a different scheme is needed. I would first try running your rig into a dummy load and see if you get RFI, if so this will give you some clues. Rick KL7CW