sv2 shims on bellcrank
 

what effect does adding or removing shims from the bellcranks and steering knuckles have.

you can raise the entire centre ackerman by adding shims on the bellcranks which will calm the steering down.

however many mm (max 4mm) you raise the centre ackerman you should raise the steering knuckle ball stud too, to keep the bump steer the same.

as Mikey said raising the center track rod will give less initial steering, and generally makes the steering calmer, what ever you lift the track rod buy you must also do the same for the ball stud on the steering hub