Thank you for the interesting update! I am, as you might guess, very happy that you are having a positive experience with the KIMs. Your descriptions are excellent, and neutral yet not sterile is a good encapsulation. The inert quality that you touched on is also of primary importance, and I believe that the cabinet design is a big part of allows the speakers to perform exceptionally well.
I am very familiar with the temptation to squeeze a bit more out of a systems, but barring my living in a home with a much larger listening room space in the future, I feel no desire to move any further down the long speaker upgrade path on which I have been travelling for nearly 50 years now.
Have you experimented with vibration control yet? I found the addition of the IsoAcoustics GAIA made a noticeable improvement, to my ears (they fit well with the dedicated KIM stands).

