if you have a motor that is too twitchy (most mod setups) I would probably suggest you use a throttle curve to make the acceleration linear. when you pull the trigger it delivers current not speed. the result is speed but the current is delivered in a linear fashion not the velocity. 1 amp will equal .1nm at high speed but .5 nm at low speed. .5nm accelerates much harder than .1. if you want to make the car accelerate more linear than use a throttle curve that adds less throttle in the low range and more throttle (current) in the high range. this will make speed more linear. if you shrink the throttle range with d/r you will be dropping the portion of the curve that is near the end. which might be needed but because the torque you get at high rpm with a full trigger squeeze is low it may not do much for you. a full trigger squeeze at low rpm is a different story but low turn motors probably need a little trigger caution at low rpm.
find the lowest speed corner before a long straight and smooth out the throttle to exit that.