I recently completed assembly of a Aostirmotor S07. When test riding the bike there is a sudden acceleration when I began to pedal with the PAS set to 1 or higher. I can reach 10 MPH in a very short stretch of road. I have ridden other similar fat tire bikes such as RAD and Cyrusher. All have much more tame response to pedal input. Is there a way to reprogram the control box so it wont be so aggressive?