After approximately 7000 km i find an uneven tire picture at the rear axle. While on the outside there is approx. 3,5mm present profile, the inside is at least 5mm.

Does someone have similar experiences/explanations/solutions?

Do you think it´s because of the wheel discs (H&R 18mmm) ?

 

You need to check your alignment. You are running too little negative camber at the rear

 

It´s the factory alignment - do you think porsche delivers cars with incorrect alignment?

Thx.

 

Yes. It is not uncommon at all