Good morning Gumby,
Couple questions for ya: How long were you on the wagon and off the wagon at the different times? When you fell off the wagon, what do you think was the root cause (ex: not planning ahead, holidays, vacation, etc)?
Accountability definitely helps - why not post your daily menu on the On Plan thread here every day? As to motivation, there is a great thread that discusses it within the last two weeks or so - lots of good concepts that may help.
Good luck and hope to see you around!
The only things that work are systems, schedules, and strategies.