I rebuilt a dilapidated, yard find cruiser with 36V Amp DD motor, 22 amp controller and on/off/throttle. The bike and motor were refurbished, and the system runs great on a bike stand, but won't accept full power when I'm on it unless I accelerate very slowly. Also, occasionally when the throttle is released, the motor still provides some power and I need to use the "off" switch (the 36V battery had been used effectively in a mid-drive). Any ideas?