msjoleary,
I've also used the Natural Brilliance course, and found it did helped me towards my goal, in the sense that it opened my eyes to the times when I'm in a stuck state, and what to do about it.
Have you identified when or how or between what Stop Signs you oscillate in regards to your weight? For example do you oscillate between "I want to keep my old eating habits" and "I want to lose weight", or something like this? And if you have such oscillations, are they still present now, after you've completed the course? I think that if you still find yourself oscillating, then you haven't really uprooted your Stop Signs yet, and that is why you haven't witnessed any changes in your thoughts as a result of this course.
Perhaps you can listen to the Paraliminal Natural Brilliance Generator once a day for some time, like a couple of weeks or so, and see if that helps to install the ideas of NB into your inner mind and help you take out whatever that's holding you back?