I have now taken the upper control arm off again, and loosen all bolts around the rear axle, and the chocks before mounting the control arm back again. After then I start tighteen the screws carefully in steps before tighteen the last bit and then mount the chocks back.
It does works better now I have to admit, but I still feel the rear is stiffer than the front.
Guess I have to accept this as I´m out of ideas.
I guess I need to try another bird and compaire. Just need to find one somewhere....
If anything new comes up, I´ll come back with that.