I have a variable speed controller with a 500K potentiometer driving a DC 180v motor. The motor has an RPM of 4000 but I really only want to use a range of 50-400RPM. When using the potentiometer I'm finding it is overly sensitive and isn't giving me the control over the lower RPM that I need. Would adding a fixed resistor across the Pot reduce the range of RPM? If so what value resistor should I start experimenting with and which wires does it need to intersect?