The later Classe CA-200 with the heat sinks on the side are reported to be much better than the earlier model with the heat sinks on the back because of "distributed capacitance" - caps distributed over the circuit board instead of just at the power supply (as I understood it), and equal to the replacement CA-201. There was a later version of the CA-201 that was said to be much smoother. It has aluminum "pillars" at the front corners. I had the earlier version and it was a bit coarse. Classe was said to be a good match for B+W.
You haven’t mentioned your cables so I will add that better cables could give you more clarity. Recently I upgraded my speakers and have a bit of glare at higher volumes too. Until I can demo cables I have stuck Post-it notes over the tweeters. It works surprisingly well, costs nothing and puts the fun back into listening. Good luck on your quest.
Bill