The tyre wear problem with the KAW set up wasn't with the rear. There is sufficient range of adjustment in toe angle and camber. The issue with the rear springs coming into contact with the 'wishbone' isn't affected by camber, as we are dealing with the fixed end of the attachment points.

The heavy tyre wear was with the front end. The camber adjustment Was at its limit.
But I think something else had happened to the car while in storage which had affected the alignment just enough. There are a few other issues that suggest the car wasn't taken care of properly, but it's almost impossible to prove.

85 WR quattro
90 V8 Silver, 91 V8 Black, 93 V8 Lago
93 100e quattro V6. Titan, i think