Thanks everyone for the help, I am making quality cooks so much so that people are wanting to buy slabs ans briskets already and its only been a month. But the temp has been a bear to keep steady when I was cooking with only wood the temps would spike to like 500 then I would have to choke it all the way down and the minute I open it just a tiny bit it would flare back up. I have modded it by sealing everything up with gasket maker, I extended the stack on the inside, I even did the oven gasket but it didnt stop everything. I have even contemplated switching to a propane firebox. I would love it to stay between 275 and 300 but its hard.
CharGriller Duo 5550 with Firebox, Weber Gold 22.5, 2x Maverick 732's