That looks amazing! It's pretty impressive that it can be as good as that with only 1 LED. I mean, three I can understand, but only 1?
I can somewhat understand that it's hard to get the directional stability of the car right when using FreeTrack. But are you sure that it's not just a steep learning curve, and that once you've practiced enough with it you'll get comfortable? Sounds to me that given enough practice it can be a pretty useful tool.
I'm going to visit my brother later this week, and I'll ask if I can borrow his 1-LED reading lamp thingy. Will report back here when I've tried it.