Amps - Bryston SST, Lexicon LX-7, Anthem MCA-20, Krell KAV-300i
You may have lots of gear, but it's all solid state, all muscle amps. I would definitely not pair any of those with Khorns or Lascalas so if your impressions were with those kinds of amps I can understand your reaction. Even if not, I do get that horns are not everyone's cup-o-joe. No need to explain the preference further. There are very few SS amps I've heard making music I'd like to listen to with Khorns (McIntosh does a fine job though for some reason, and I'm sure there are some others, but in general it is a challenging match-up IMO, and more often than not tends to sound harsh or shouty to my ears).
Have you thought of putting tubes in the mix somewhere? Perhaps a tube pre with HT bypass? Or perhaps using SS amps known more for their finesse with music than for their muscle (Pass, Ayre, Plinius, etc)? It may be something worth considering if you want to put any kind of stress on 2-channel music listening. That's not to harsh your amp selection...but I could certainly think of better choices for music. That said, I've heard some older Krell amps sounding really great with Martin Logan speakers. I can't recall the combination as this was many years ago. The only amp I have any exposure to that you own is the Bryston (I think I've heard their 3 and 7). It's fine, but not something that particularly would float my boat for music.