E61MAN535

Hi everyone new here just after some advice regarding my 535d basically I’ve just had the front end tracked and they used laser 4 wheel alignment, the results of the rear shocked me I have negative 4 degrees right hand side and negative 2.1 degrees passenger side (UK). I’ve changed upper arms on the rear to see if that’d cure it with no avail. Also I’ve tried adjusting the camber bolt with no luck there either.

Driving home the last few days it feels loose on the rear especially when I corner hard left, almost as if the rear wheel loses the camber straightens up then snaps back again? It has got me slightly worried as I’m not sure where to start next.

any ideas greatly appreciated
thanks
Luis