I had a problem with a pitch raise on a Yamaha U3. It was about 60¢ flat and after the first pass after ending the pitch raise mode the piano was very sharp in the top two sections, nearly 10¢. Normally when I do a pitch raise the tuning is very close and minimal work is required for the fine tuning. Perhaps the algorithm for that much of a pitch raise needs correction.
Very interesting. Do you know if there is something special about the plate of the U3? If you still have the tuning document, I could have a look at the initial pitch mesurements.
Have sent file to you.
I'll join you. I noticed this one too. If the piano is too flat, the Pitch race is then too sharp in the high part. E.g. the piano is -40 cents and after tuning the discant is +10, sometimes 15-20 cents sharp.