After more searching and reading about the ackermaan geometry, I decided to change the angle of the steering rods.
R&P mounted.
To avoid bumpsteer, the steering rod's should be parallel to the A-arm.
After lowering the steering rack by 1,5cm, the rods are parallel and bumpsteer Will be minimal.
Tomorrow I will do some tests with a wheel mounted, hopefully I got it right.
Paul.