How to do the tuning with DRV10983 based on the new designed motor and PCB

Hi,

There is a  project which design for driving a blower using DRV10983 and a MCU. The designed(PCB,software,motor) is finished and verified.

But now the motor is re-designed for optimization(the other part including PCB,software is not changed).After embedding the new motor into the current system, we found that the behavior of the motor is not correct: while the PWM is between 0% and approx. 50%, it spin up for several seconds and stop finally.while the PWM is beyond approx. 50%, it will spins up for a while with unstable speed and spin to the max speed finally.

In this case, I wanna know if it's a must to do a new tuning? How to do it?(I don't have the DRV10983 evaluation board and USB2ANY I2C tool on hand)