Calibrating self leveling question

[taosx5]

Hey all, I have been searching the forums and can't quite find the answer to my question. Here is the deal. I have an 03 4.6is. In the winter I run an all weather 18" stock BMW wheel (255 X 55) and run the 20" on staggered summer tires (Vredesteins 315 x 35 rears). I noticed some unusual wear on the inside right rear when I put the summer tires back on (I can't believe I missed it when I took them off early winter). I checked the tires I had run all winter and there was no unusual wear on these.

I took the 4.6 in to check alignment. What it showed is that the right rear was out of the recommended specs. Specs show camber ideally should be in the middle of -1.5 and -2.4. Mine was at -2.6 and could not be adjusted any better than -2.5. That is why it is wearing the inside edge of the tire cuz it was out of spec ie too much negative camber.

After talking with a BMW Indy shop and the alignment shop, both recommed having the rear suspension calibrated to bring the right corner up just a little bit. Is this the approach I should follow? My 4.6 has 93K miles on her. Any advice or suggestions appreciated. Thanks