I am not familar with these servo's but the one thing I know is in oval speed isn't always the best way to go. I would look a the specs for them and put the one with the most torque in the car.
torque is what your looking for this keeps your front tires from jumping around and turnning left Most drivers think a high speed servo is better but I like more torque I drive a T4 with a 13.5 Fantom on a dirt oval track with a 156 ft drive line so you have to keep the front end planted
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