If the front spring set up is too stiff you will always spin out because the front of the car is a little heavier then the rear and it starts to bounce and you can lose traction. Now if you use a softer spring in the front the car will actually absorb the bumps better just like in a real car and will have enough traction not to spin out. I use red springs in the front and blue in the back and this does the job for me. Also try a faster motor then your stock motor to break in the gears I'd say use the Tamiya sport tuned motor 27T or the Tamiya lightly tune motor 28T. Both motors a better then the stock silver can motor that the car comes with, the Sport tuned motor has a good steady band of speed and the Lightly tuned motor has better top end speed. Run the car thru at least three battery charges and make sure your motor pinion is on tight otherwise you will strip some gears I always check to make sure I tighten the pinion right before I put the motor in. I use a little cement on the screw to make sure it does not move. I hope this helps you out a bit.