I have 4deg castor shims I just removed them and it made no difference. I am interested in the steer ahead adjustment I would imagine you should disconnect the drag link and go full left then full right and then back to center and with the wheels in the straight ahead position adjust and reconnect the drag link. I would imagine that a power steering sector increases pressure when it leaves center to add pressure for turning. I will look at this tomorrow. I had this aligned Saturday and everything is right on spec.
