L of the W, I'm with Cooperman In that hard starts or launch as they seem to refer to it these days is the only time you would really get the springs winding up! If you drive it like a scolded cat, and why shouldn't you if that's your bent! this won't move the springs too much when in forward motion. However one ATB ie. one on one side of the car will unbalance the car quite a bit if you get any distortion in the Springs whatsoever as this will induce some level of rear steer effect coupled with a height difference between wheel and body either side of the car. I have always thought that the fitting of just one ATB was a ridiculous solution to spring damping by MMC. You may be correct in that the battery cage prohibited MMC fitting the other sides ATB as no doubt all the Cassis' out back had the mountings in place for the battery. You could have a word with Cain at Wolf Performance, he sells ATB's and I'm sure he will offer good advice but for me, well I think I'd take the ATB off if I could only have one and have a balanced car, I'd like to also see if just having the one would allow the potential spring wind up to find the weak spot and in fact cause the unsupported side to cause a greater level of wind up to that spring.