One conclusion I've already come to regarding the addition of the ribbon tweeters, they make bowed string instruments sound way more real/palpable. Maybe it's the added upper harmonics? dunno? But violins and especially Cello's sound way better. Plucked instruments also are crisper, but that I was expecting.
The clarity I hear on some songs is literally startling at times. ;D

I've done some other tweaks to my TABOO and CSP that are of course contributing, but the tweeter is undoubtedly a large part of it.