the e36's do appear to sit low in the back, meaning that if you're used to a non-bmw, the tire will look unusually close to the fender lip. that's normal. but having the rear suspension misaligned to the point of uneven tire wear is not normal.

if you use the proper lowering springs or shock/spring kit, you should be able to run with the proper camber with no issue. i think your suspension has a problem that needs to be fixed before you tinker with the ride height.