You'll find that putting your meat or main course in the middle pot works best. Breads or desserts on the bottom. Side dishes on top of the main course. Timing is important too. For pot roasts, they should go a couple of hours before putting anything on top that takes less time. Check out some of the youtube videos that are now available for
stacked dutch oven cooking. I rarely have to stack because these days I use a DO cooking table with a tall windscreen and make only a couple of recipes on it. If I were DO cooking for a crowd it might be different and I would stack. Now the crowd does their own cooking and brings it along.
There's a ton of DO recipes on the internet now. Just do a search for dutch oven recipes.