There's a lot more to it than just going straight. Eventhough they launch straight I've seen many cars and trucks pick the the left front tire 3 feet in the air and the right tire is still on the ground. In other words the chassis is so twisted the weight is not on both rear tires equally. An anti- roll bar or pre-load bar will take a ton of that twisting out and get your 60' times down a good bit. I agree, do not use a pre load bar to correct a bigger problem.