VPI 300 RPM vs 600 RPM Better?

I am getting too much vibration from the 300 RPM motor. I putthe 600 RPM motor back in, vibration gone. IMO, the 600 RPM is quieter.

Vibrations can be remediated in this regard. A moongel or sorbothane type pad can be placed underneath the motor pod - remove the rubber feet.

I believe the 600 rpm motor has twice the torque of the 300 motor. I have no 'vibration' problems. When I brush the record with stylus down on my Scout I notice far less speed recession than anything else I have ever owned, including rim drives, DD's and other belt drives.

I strongly suspect that the amount of motor vibration varies quite a bit based on the position of the magnets in the motor which I understand is not very precise.

Small changes in the phase of the motor drive makes quite a bit of difference in how smoothly the motor runs.

You can probably do this by tweaking the phase shifting cap value but the easiest way for me is to use a computer to generate the drive signal using an inexpensive frequency generating software.

I went back to the 600 RPM