I'm having the exact same issue with my car after installing the lca relos and adjustable UCA. Any time I load up the suspension and accelerate, the car wants to shoot to the driver's side which requires a correction with the steering wheel. When I let off the throttle, I then have to correct and turn the wheel back to the driver's side.
Does your car have the Torsen rear end? When I was deciding whether to get a Track Pack car I remember hearing people say the Torsen was a bad choice for drag racing. Maybe it has some I'll effect on straight line stuff?
I also want to add my car was on some Mickey Thompson ET Street radials on the cheater v6 rims at like 25-28psi during that example I said earlier. First time I ran the suspension mods and MT's I was going around a 35mph corner at around 40 and my car felt like the rear end was stepping out from under it. When I'm on my stock brembo wheels/tires my car has pulled the front end to the left and right but not like on my slicks, and my slicks seem to always pull left.