Did it pull before you did the wishbones??
As if it did it before it could be many things including uneven tyre wear, rear beam bushes, wheel bearings etc, you could try swapping your front and rear tyres??
As for the anti roll bar, you can fit a s3/tt one its just you would have to buy adjustable drop links and modify them to fit rather then just bolting them on but its does give more clearance than the eibach/JOM over driveshaft ones.
