I would suggest that most people don't use insulin leading into a show, especially if you have not been using it leading in. In fact, if you are looking good, I would change as few things as possible. Most people mess their prep up by making dramatic changes right at the end. As the old saying goes, If it ain't broke, don't fix it! By the time that you are ready for the stage, you should know exactly how each food and supp is going to effect your body, so that you can predict exactly what is going to happen. Don't take any risks! You've worked too hard for too long to screw it up now