I recognize my findings in your review, and I agree about the technical points you accurately described. But I've a different conclusion:
- I gave a different recommendation in my review, because I think that buying it at the CS+Synchron Strings owner price is a good idea and I recommended it as a complement and immediate fix of Synchron Strings I (to get bigger sound, to get divisi effects, to improve legato, to improve slurs and introduce portamento etc.), that as you also say is very effective.
- I don't think the blend is affecting all the articulations, but of course it's evident in the vibrato sustain, being it likely produced blending normal vibrato in low dynamics and vibrato espressivo for high dynamics. Maybe they did similar tricks to create new artificial velocity layers... But in general the recalibrated velocities in my opinion are giving uniformity and more consistency across articulations and sections (maybe it's a subjective perception, but I had the good feeling of being forced to a lower amount of editing for sound balance of phrases).
I agree VI Chamber Strings are still great: if one buys SYNCHRONized for special price it's because he owns them (and he will still love and use them).