I think you are going to have some play built into the system, I set my lower lift arms to the widest setting to the outside of the clevis points and if you put side to side force on the tail wheel, it has some movement. 4"-8" at the tail wheel is not going to be much closer to the tractor.
You do need some give in the system for when you hit something which you will eventually.
Your operator's manual will show proper setup and the pivot hitch is supposed to be at about 45 degrees to allow it to follow the contour of the land.
I have a hydraulic top link and adjust it tight to back over ditches etc., otherwise I let it float.