You need more junk in your trunk!
Seriously though, a few things come to mind that you can check for. Are the tires in good shape? You're not using drift tires, are you? Are the diff's too tight causing a locked axle effect? How is your camber setup? You say you balanced the car but is the weight distribution biased too far to the front?
Can you include a few photos of your setup to help us out?