I know your Watt/Puppies well. A good friend of mine had a pair for decades. They are a very easy going loudspeaker. They also benefit from subwoofers. They are the speaker that put Wilson on the map and they are better sounding than any Tekton by a mile.
At any rate your problem is quite simply that something is wrong. Perhaps your older recordings were poorly taken care of. Maybe a tweeter is blown, speakers out of phase, something. There are plenty of wonderful old recordings that are thrilling to listen to on a good system. If the Wilson's are in good working order it is not their fault. I am not crazy about tube amps on Wilsons but I doubt that is the problem.
At any rate your problem is quite simply that something is wrong. Perhaps your older recordings were poorly taken care of. Maybe a tweeter is blown, speakers out of phase, something. There are plenty of wonderful old recordings that are thrilling to listen to on a good system. If the Wilson's are in good working order it is not their fault. I am not crazy about tube amps on Wilsons but I doubt that is the problem.