I have not bolted the diffuser plate to the firebox/CC wall which leaves a 1/4 inch gap allowing air to move up into the CC instead of down from the Firebox. When I close the gap with aluminum foil, it makes the FB side of the CC much hotter, which is odd to me. Has anyone had this issue? Should I bolt the diffuser plate to the wall or will it also cause the FB side of the CC to get hotter?