This was a decade or more ago, but I seem to recall Ed Uding chiming in and telling us that there were 2 (or more) different sets of underbody molds and depending on which one made your underbody, it would affect the stance of your car. Hence how a set of lowering springs might look slammed on one car and not on another. Factor that in with panel alignment and this can explain what we are talking about in this thread.
20069 One of the last few built has the tire centered in the opening even with the car lowered.
Steve