[Aussie Mike]

Could the camber of the road be pulling it left or does it do it on a flat surface like the drag strip?

When the engine torques over it lifts the passengers front side of the vehicle and transfers weight to the drivers side rear tyre. Aussie Drag racers have been building left hand drive vehicles to take advantage of drivers weight to help preload the chassis. They often run more preload on the right rear spring or use a stiffer right rear spring. It'd be interesting to find out what your corner weights are.

Cheers