Worth a try for sure. I did see some of your footage on Photobucket, I can tell right off the bat what you are talking about. Especially the one with the classic and sports car gathering at the T intersection. That "nod" as you call it, is pretty pronounced. I am not sure stiffer dampeners will fix that. It kind of looks like a gains setting? And your upgraded compass had no effect on it. Could the bird be fighting crosswinds and correcting? To be honest, I have yet to find my ideal gain settings... I keep trying, either overcorrecting or oscillating or slow response.
Nice cars, BTW.
You are right, it is just enough to benoticed and it doesnt seem to be "just right".
P.S.: Sorry for snooping, but the video was there when I followed your crash