Burt,
Not saying "I told you so", but I had the same experience, though it was with a Yam Stereo Amp.
I had a Technics SU-A808, which I sold and replaced with an AX-497 and was very disappointed with the "promise" and the end result.

(I will need to start weaving about here to avoid the punches that will be thrown at me)

The Yam just did not have the punch I was looking for, although they claimed 85W RMS x 2 @ 8 Ohm.
Eventually sold it a year later and replaced with a 60W x 2 Cambridge Audio, which I am sorry to say (to all the Yam fans), sounds MUCH better even if it does have less "power". Here comes another swipe...

I cannot give you advise on what to do to make it "sound" better for you. I doubt that cabling will fix the issue to such an extent, that you will hear a marked difference.
My view stated in the paragraph glowing in red.
SU-A808 for those that remember these: