"according to them improved the handling of the car"

Key words, "according to them".

I suspect that real world testing on a skid pad would yield a lesser "g" factor than the stock arrangement.

This is just human nature. When you make a change on a car, you want to imagine that you have improved it. You don't want to admit to yourself that it handles worse in reality and you certainly don't want to admit it to anyone else and make yourself look stupid.

It's not only the camber that you change, it's camber gain, roll center and roll couple distribution.

I contend that the best way to lower the car is with dropped spindles or by "z-ing" the frame, leaving the geometry as it was designed by factory engineers who know a lot more than Chip Foose.