If a Conrad Johnson amp can't fix it then you should ditch the speakers. Having said that way back I had a pair of Spendor BC1s and still rate them highly. Maybe things have changed at Spendor.
Warm Tube Amp(s) to Tame Hyper-Accurate Speakers?
I have these Spendor D9.2's mated to an MC275 VI and the mids and highs are still too much, sometimes. Sometimes the sound is sublime based on the recording, sometimes harsh. I imagine perhaps Focal and B&W folks know what I speak of, maybe not Magico owners. Even using a C2700 tube pre-amp. Can this be solved with a WARM tube amp, and if so, which ones? I like my MC275 VI but I am open to suggestions.