I'm not saying there's nothing wrong with your car but I think they are set up so well I think it just follows what the road does.
They are so sensitive to road conditions it's unreal, mines always pulled to the left, put new tyres on it (on the front) and it tracks true, eventually it comes back, I think the tyres wear to the camber of the road.
It's started pulling to the left again after new front tyres 1000 miles ago, I've just fitted new rear tyres and near the top of the road it's pulling to the right. with the new fronts on, I was getting (sometimes) like a weave from the rear before the new rears were fitted.
Are all your tyres like new?