Hi new to community . I have a char grill duo with the firebox. Have had about two years and when I use the smoker have trouble with temp control and even have the heat from the firebox go into the chamber. I will load the firebox full of coals and wood. I read about the baffle and tuning tables. I have not made any mods yet. But if anyone could give step by step instructions that would be very helpful. I have not fabricating skills or the best at building things. Thank and looking forward to being a part of the community.