Motorized volume speed adjustment

I have a Parasound preamp that I think sounds excellent but the motorized volume control moves so fast I can't remotely dial in a good level. I've tried adding some resistors to the motor to slow it down and that works to a degree but the mechanical resistance of the pot makes it stick so I have to lower the volume first then raise it to get the level I want. I've thought about using diodes to lower the voltage that goes to the motor thinking that might give a little more instantaneous punch to overcome the mechanical resistance but haven't had time to experiment.

Has anyone out there had this problem and come up with a good fix?