Carrerra Shock Part Numbers. If you don't use your brakes much, you'll probably push because you'll have no weight transfer forward. You may want 55-45 front to back distribution. Move the weight around with weight bars from left to right depending on track conditions. Left side weight will loosen the car, right side weight will tighten the car.
Most cars are over-sprung if they have a truck frame.
You may want to shim the right front spring to get the proper weight distribution to all corners of the car. The rear shocks should be mounted as near to 90 degrees as possible referenced to the rear axle. Use lightweight wheels, brake components, axles, etc. It may be advantageous to mount shocks upside down where possible to reduce unsprung weight. The shock assembly has some weight to it, whether it is enough to worry about is debatable.