Personally, I think I would do like
weight-loss programs do...taper
off just BEFORE you get to your goal
weight and try to finish to the end "all by yourself". Otherwise, I think you will have a hard time maintaining - not just physically, but psychologically.
Good for you, though! I'm glad you are doing this "legally", and with a doctor's approval. I know NOTHING about adderall except that I've seen it in magazines. Would it help me to behave?