It was a 30mph 0.8 g chicane into the parking lot at work.
The point isn't to get a perfect match in degrees of actual wheel turn to theoretical angle needed, but to look for large deviations at certain points. Unless you are over steering around the whole corner (that would be drifting, not minimizing lap times).
It's the relative difference that matters.
Under/over steer shows up in G plots, it's just more subtle. With the overlay between the two steering plots, you get a better picture of where that is and why.
I didn't work very hard to get them to overlay. Again, it's big deviations that matter, not absolute accuracy.
When I get a change, I'll do a calibration run down to the culdesac at the end of my street and see what happens.