The caster shims go between the beam and the frame head.They will tilt the beam ahead or back,depending on where you put them,top or bottom.The ball joint eccentric is for camber,or top of tire tipout as looked at from the front of the car.I never really thought of it,but that will affect caster,but it must not be enough to bother the handling.The germans would NOT have built them that way if the handling was going to be affected.
