Does motion averages say your up and down speeds are the same. if not you can adjust them through Drive adjust, ADC 1 offset I believe is the parameter. A minute change like -.001 or -.003 affects the down I think. Up is not as touchy .005 or something like that. make a change then run the car and watch it come in to the floor. Also in MSU Adjust there is a parameter that may be affecting you. Min Pos Err. dictates how far away from the floor you can be and still set the Brake. Check this first.