You are overreaching the problem!
A sway bar by design does not mean it is to sway when working, rather just the opposite, it is there to center or offset the implement on the 3 point and then secured in a solid manner, some manufactures use turnbuckles and or a combination of chains /links/hydraulics/etc but all will be tight prior to working the implement (unless of course you intend to break your 3 point hitch!!
Shortening the bushings #31 will allow the arms to swing wider for hook up (your problem) and that will have NOTHING to do with #32 (it stays the same, do not alter) what makes the setup solid to your tractor is the finial tightening of # 35 NUT (bolt/slot) once you have your implement positioned as you want it THAT PREVENTS SWAY!!