I believe that the pendulum effect is bigger if the motor is more further away from the rear axle. This means that smaller gears will make the car more relaxed as the motor will be closer to the rear axle.
No, I know it seems like it would be that way but it's the opposite. Just like moving the batteries forward makes the car more settled, same with motor. Plus moving the motor closer to the pivot point in effect will reduce unsprung weight.