Did you do this job yourself? There's no adjustment for rear wheel alignment, but certainly it is possible to damage parts and cause tracking problems. Were the bushings in the torque rods and (especially) the panhard changed? Without problems? I've never heard of anyone ever needing to change the front bushings on the rear control arms. Probably takes 30 tons of force too, I'd guess.

If the tracking isn't heightened sensitivity due to the work being done, I'd go over each part of the work and check it out before mucking with the front wheels in some effort to compensate, unless it is possible one of the big rear bushings was so shot, some P.O. had a steering correction made up front to sell the car.

-K