Moog offset bushing install question.

I'm afraid I'll make this even more confusing while trying to simplify...
What limits the travel on the alignment rack is conflict of 2 parts, the bolt and the slotted clip that it goes through. Since cutting the slots out longer to allow more travel doesn't work, repositioning the bolt is the solution. Maybe placing the arm in the clips without a bushing and/or try to get a mental picture will help.
You'll find the bolt needs to shift the opposite direction that the arm needs to travel.
Thus the same effect as cutting the slots longer. "Don't raise the bridge, Lower the river" seems to apply here. LOL
Why one bushing offset is opposite the other has to do with how changing caster effects camber and creating enough travel to get the camber angle right again.
Right there is where alignment geometry gets too complicated for me to attempt explaining or simplifying here.