Unfortunately (or, perhaps, fortunately), a car can launch straight and still be losing performance because the rear tires are not equally loaded. A Camaro with stock suspension will unload the right rear due to driveshaft torque. As any roundy-round racer would agree, maximum performance from a tire pair is achieved when they're equally loaded.
Having said all that, I, too, would say NO to static preloading. The problem with static preloading is that the necessary amount is so large that you end up affecting handling on the street. You might consider some of the other techniques at my site and save preloading for fine tuning.
http://www.racetec.cc/shope