If your drifting/slipping to one side you tires are slipping. I would get everything properly set up with regaurds to the suspension and alignment, then see where you sit after that on this concern. I'd get it all dialed in and go from there. I noticed this in a friends z, while under hard boost the crown of the road and the fact that the steering wheel was slightly counter clockwise to compensate made it want to drift/slide to the right.
" I told my son, you have to catch the football other wise this just looks like child abuse." - My brother
