Stick to your schedule and your recipe. If you are going to change stuff, change it in practice.
If you have a bum member of your team, get rid of them or relegate them to the crap jobs like cleaning dishes. These jobs should be reserved for the members of your team that are on "liquid duty". Make sure everyone knows to stay out of the way of those cooking, cutting, building boxes.
Only sober people are allowed to walk turn in boxes. If it's a big competition, I've heard to have two people do a turn in. The bigger of the two walks in front and acts as a wedge.
Be willing to say you had an awful cook and your turn ins sucked. You won't get better if you always think what you have is gold. Ask another team to try your stuff and get their opinion. Assume they aren't lying to you and take the critique. Also if they let you, try their stuff and ask them about their cook.
Help out your neighbors. Cook teams will forget stuff or stuff can break. Be a stand up person, if you can, and help them out. Good karma goes a long way. People will remember the team that had their back when it's your turn for Murphy to visit.
Learn how to turn people away who are expecting free samples while you are trying to create your turn in boxes. It's amazing how many people think that we are there to service them. I'm running around crazy busy trying to politely ignore as much as possible and some of these jokers expect me to stop everything, let them rummage through my product, and let me know their thoughts on it. I've even had people reacted like I was being rude when I explained that this is a competition and not a buffet, but they are welcome to purchase people's choice tickets.