I was on vent at the time with BigTime and he was very surprised that you were up so high on the track at that point. I don't know what the situation was with the bottom car, but the natural instinct in a corner like that is to compress toward the bottom. Obviously, staying too high means you lose a lot of time to the car(s) on the bottom; pressing lower means you lose less time. Following the painted lines in the corner is generally a bad idea, as they are at a constant radius while the ideal line through the corner is not.
I didn't see it, of course, but from what BigTime said it sounded like he turned down as he normally would in that situation and was surprised to find you where you were. His exact words, I believe, were that you "drove into the side of [him]."
Using your left and right-look functions in the turns on the oval is a pretty much constant necessity in order to gauge side-to-side distances (though of course the longer you do it the more you rely on instinct).