Nice work. Basically the same setup I have on my GT350 and the rear feels so securely attached to the car, but the change in the alignment from the dowel pin correction was shocking.
It depends on how sensitive you are and how hard you're pushing the car. I noticed the slop in the rear the most with mid-corner corrections or some of the mountain roads up our way where the corners can sometimes decrease in radius mid-corner. When making that secondary steering input I could sense a shift/delay/pause in how the rear of the car would be gripped up, then take a split second to adjust to the new steering input.im shocked this would happen on a car like this from factory. does the car actually feel better with the braces and alignment kit? you wouldnt think a gt500 would need one