Interesting way to "see" it Michael. A "ouiga" board gives the same interesting response to negative camber and asks you to run large toe-out to zero the board. (imagine how a loose tire rolls across the paddock: if 0 camber, it goes straight; the more it cambers, the tighter it turns in that direction; if a pair is on an axle and we increase the toe out, will they be happy going straight; is the actual/dynamic/loaded drag or toe -0- when we run this large toe-out with 2 and 3 degree cambers?)
I'm not sure, but it was quite interesting when I first discovered it. My spin-
It gave me a good reason to try more toe out at both ends of the car.
Street cars with large (say -2*) cambers don't seem to feather the treads at 0 toe but do when toed in or out-doesn't compute/doesn't fit neg camber=toe out model.
I tried coast down tests on the street w/my A2 from 40mph and longest rolls were at half of the toe that zeroed the ouiga board.
I used about those numbers on the car: .040-.060" @apex of sidewalls, frt and less in the rear.