found the issue. Don’t use the “aileron left (roll left)” or “aileron right (roll right)”. If you do so the game behaves like a drunken duck. You cannot stop stearing its wanking and turning way too much.
Funny is that it reacts on left an right stearing, but in a way you don’t want!
I have now set aileron, elevator and ruder to the axis without the left/right stuff. Now it works.
I always thought they just have overdefined the controller with way too much settings which makes no senses and their german translation is a pain ontop.
To roll a plan you need one axis but NOT a left axis and another right axis! The axis makes left and right all in one. I have no clue what the programmer thought by seperated the axis in one left axis an one right axis to roll the plane. Probably they have never steared a plane or used keyboard for it 
Anyway - its flyable now, so i am happy.
Why the heck the game has forgotten all joystick settings during update is a miracle to me.