Sorry but its sooooo annoying. I read soo many tutorials but the inversions always have kinks and dents and stuff in them and its not smooth at all. Its really hard to explain! Please, please help!
I just realised something you didn't include in your tutorial Jimmy. You forgot to say anything about vertical sections of track, and the problems the AHG has with them.
That sounds most like your problem, Jordz. Make sure you don't colour the vertical parts of the loop black, that can cause wobbles in those areas.