Alignment Job Results: Rear Tire wear

[EdzBenz]

Fellas,
I have gotten considerable uneven tirewear on my rear tires over the past 6 months. The wear looks like the symptoms of my camber being off. Meaning, the inside of the tire is much more worn than the outside.
I wanted to be 100% sure my camber was out, so I took my car in for an alignment yesterday. Here are the results:
Target Data for rear camber is -1.13 +/- .3
Left Rear Camber: Before @ -1.31; After @ -1.32
Right Rear Camber: Before @ 1.52; After @ -1.53
The dealer told me that the car cannot be aligned any further into specifications unless they start replacing parts.

I have 17" Brabus rims with a 235 width tire. Would an adjustable rear camber kit allow me to address the camber issues? Is this the cure? Please let me know your thoughts or if you need more info. Thank you,