This is how and why so many audiophiles spend money on the wrong parts of a system. Chasing down a character like this guy is dealing with before fixing the wire coloration that is causing it, that's the start of the audiophile blues. He can smooth his system out with wire with the existing amp, and not be using a colored cable to do it but instead going with the neutral place a system should be built around. There is such an extreme coloration from wire that any choice made on an amp would be the wrong amp when you get around to a wire upgrade later. Guaranteed you would like Audience or JPS wire in the existing system, then your component upgrades can be done from an enhancement angle as opposed to trying to band-aid a major problem. Lot of responses here for nobody to be picking up on that, although I didn't read them all.
When putting a system together around speakers like Wilson Audio WP7's it isn't the amps that are as critical as the wire is, wire colors the amp's sound.