Theres 3 things to be done in the rear.

The "eccentric arm" aka one that does the toe. You said thats done so good

The read balljoint you also said was done.

Did you do the rear top control arm? Itll be the one dead center behind your rotor.

Depending on the mileage the subframe bushings may be shot as well. Im not sure if this affects camber. Someone else will be able to chime in on that.

Do you have 4 corner air? Are you lowered at all or not?

Mine is at 86k i havent done any replacement yet of joints. Its lowered alot and i had my camber dialed in as close as possible (around -2.7 both sides) and big thing is just get them to do that and have the toe dialed out to zero on both sides. You shouldnt have any bad tire wear after that. Mine has been like this since october on the new rear tires and no abnormal wear, inside edge just like the outside.

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2006 X5 4.8is Fully Loaded