I enjoyed reading your journey to the perfect speaker. In describing your audition of the Salk SongTowers you use adjectives such as: enveloping, airy, huge soundstage, 3-D, etc. The word "depth" is missing. I like speakers that allow one to hear layers of depth when listening, In a symphony, the bass drums, brass, etc. are located well behind the violins, cellos, etc. In closing your eyes, are you able to "look" to the recesses of the stage? I like the sounds to be heard behind the speakers and well into the background.
I'm concerned by the words "sibilents" "sharp cymbals". Do you sometimes sense the sounds are too bright? Do you experience "listener's fatigue" after listening an hour or two? Does it sometime sound "too in your face?"
I wish you could audition the new GoldenEar Tritons. I would value your opinion. Both use folded-ribbon tweeters.