I have double stack XLT 3240’s and I love the ovens. The problem is the side closest to the sandwich door (Furthest away from the burner) cooks slower than the other side. If I put 2 16" pizzas in the oven at the same time, the pizza closest to the burner is perfect and the outside pizza needs to be put in for 30 seconds to a minute longer. Is that usual? I have the 1st 2 fingers on the top closed and the last finger on the top open. All fingers on the bottom are open. Let me know if there is anyway to fix this problem.