Woah.. that's a little jumping to conclusions.. all we know is for a fixed small amount of countersteering, it jumps to a much larger value..
Saying it's precisely because it's changing it's lock to 270 is plausible, but you have to just let them figure it out, it could be a myriad of things in reality..
For example, when I tested it, I used fixed 45 degree of input (Wheel set to 900 Degrees correctly), this is only 10% of the range of input in that direction, when the effect occurs, the graphic changes to approx 75% of the input.. this doesn't mathematically support the jumping to 270 degrees theory..
I'll re-test tonight, but lets be sure about any conclusions and test them, it'll only annoy people if we are wrong..
(But it is doing it!!)