Travel pedal resonse is directly related to amount of charge oil flow, faster engine is running the smoother & quicker the pedal responds. If running the engine at higher RPM doesn't improve the return to neutral and all the linkage is well lubricated, ask your dealer about replacing the dampening cylinder under the platform. This is the cylinder that has the grease zerk on the rod end. Spring inside this cylinder helps keep the pedal from jerking when driving and helps the charge pressure push the pedal to neutral.