OK first, this belongs in the 1st gen section, not the 4th.....
Again, camber isn't going to cause excessive shoulder wear unless its way out of whack, like 5 degrees or more. Toe settings out of spec will. Putting new shocks on the car should not change the alignment settings. Whatever its doing now its was doing before unless something else was changed or taken apart that shouldn't have been. These cars are known for wearing the rear tires unevenly BTW.
Are the hub bearings ok, and are the rubber bushings in the control arms still intact?
The best way to stop it is install adjustable rear toe bars so the camber can be set independently from the toe.