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.