Try changing to a stiffer spring and also experiment with the different shock mounting positions as this will change the leverage ratio making your suspension seem lighter or stiffer. Also if the buggy is sitting to low to the ground ad some preload spacers to the shocks. To get the most performance out of your suspension I highly recommend experimenting with different shock oils. Go to CEN' s website and you will be able to find setup sheets that will show you how the Cen factory racers set up thier cars for certain track conditions,