I installed a 30 amp breaker and no problems so far.PM has been back and forth with me and consulted the factory making the boards. Here is their response today:
"The factory tells me that in order to provide more torque on startup, they switched to a larger capacitor on the control board and it draws more than 20A on startup. So as long as the lathe does work properly when it does start, there's no issue with the board. Your move to the larger breaker was the correct one."