Disregard everything in the previous post for now. You can't learn to autocross WHILE you're tuning a suspension. It's like trying to shoot a moving target. And you really won't know how to tune your suspension until AFTER you've learned to autocross.

If it even half-way handles "okay", leave the car alone. Learn to drive it within it's performance envelope before you try to expand the envelope. Cars don't win autocrosses, drivers do.