I have another issue, I find the A6 and G#6 (but other notes as well) to sound very strange when pressed repeatedly, especially in the p to mf range. I attach a file. I don't know if I screwed a setting but it really distracts me from playing. Actually I just loaded the player setting and mixed a little bit some other mics in as well.
I've been doing a lot of A/B comparing this morning between Vienna Imperial and the new Synchron Imperial and came to the conclusion that they are so different you can't really compare them. I love the "clinical" anechoic VI sound, it's just like you sitting in your own little (well, maybe not so little) booth right at the piano keyboard, but you cannot compare this to the infinite variety that the Synchron piano with its multiple mics and flexible delay settings gives.
As to Gamma1734's point, that strange "wah wah" effect that those few notes give when repeated in certain dynamic ranges, actually you can hear it just a little in VI too. I'm guessing it's down to the interaction of the string tension and damper force in that particular very small range of notes, but I think it just so happens too that it's hitting something in the acoustic response of the Synchron Stage, like a little bit of "slap" which is arriving back and accentuating it.
Bottom line, I'm going to stick with VI for just playing a piano for enjoyment as the Synchron Imperial has too many little idiosyncracies, but it's got to be the Synchron for serious orchestral work.