Good stuff, thanks.
You are obvious well-experienced, and sophisticated, but I'll add one more detail. For many years I basically followed the equilateral triangle speaker placement formula, with a little tweaking. Then, after having been exposed to Jim Smith's approach (X = distance between tweeters, Y = distance between your ear and the speaker; X/Y is 83%), I found that the imaging improved, including with the KIMs.
YMMV

