Meal planning sounds like a good idea to me. Since you enjoy large meals, why not make your large meal but plan for part of it to be a snack to be enjoyed later on, instead of eaten at one sitting?
Also, are you getting enough water? How about the requisite 4 Cups of veggies every day? Are you getting any exercise?
I'm sure if you were to post a typical day's menu our resident expert's could find out where the problem is. They're really good!
Best Wishes for a Downward Trend in March!