Small nose dips and raises in 17-18kph and worse around 30kph

I just got the Floatwheel ADV2 and it rides great except for this weird behavior. Nothing I had with my GTV. It feels like “nose hunting” that happens only around these speeds.
I tried motor configuration wizard and it did not help.
Tried to play with ERPM values for Hall Sensors and Sensorless, without help.
Anyone familiar with such a behavior and can recommend parameters to play with?
Edit: I was suggested to try playing with the ZVF value, but I tried multiple values between 20-30KHz in increments smaller than 0.5. It did not make any noticeable different (besides for the annoying noise that started below 24KHz).
Any other suggestions?