Originally Posted by: Macker 
f4 Vib: -5 cents; f4 NoVib: +5 cents.
f#4 Vib: -14 cents: f#4 NoVib: +5 cents.
Hi Macker,
Thank you so much for your efforts, it confirms the respective frequencies I reported on one of my comments a while ago.
Knowing that my instruments are tuned @442Hz (the +5 cents you reported I guess, should be a bit more but the difference only is relevant here), the difference in cents I can calculate from the frequency gap is particularly similar to yours:
F3: 350Hz (Regular) vs 348Hz (Cantabile) = 9.92 cents (your result = 10 cents)
F#3: 372Hz (Regular) vs 368Hz (Cantabile) = 18.72 cents (your result = 19 cents)
Furthermore, rich vibrato tends to go to higher pitch better than to a lower one indeed... And whatever it couldn't be a global 8 Violas low tune.
With global tuning @442Hz, accurate notes frequencies in equal tempered scale are:
F3 = 350.82Hz
F#3 = 371.68Hz
To sum up, F3 is 1/10th tone too low, F#3 is 1/5th tone too low, we're close to oriental scale there...
Best,
Alain