[Shelboss]

Most of the deflection you are looking at from the side is the upper axles torquing about the lower arm. Your radius rods do not solve this problem, they do cancel some of the deflection but at the expense of the lower bracket unless your bushings have some compliance to them. A 38" long radius rod will deflect .12" when traveling 3" from center. Neither set-up is good, only a watts linkage takes the stress off the lower bracket.