Hello, I finished my side fire box smoker last year, and used it four times. I stopped because I was not getting enough heat into the drum, and way too much smoke. I thought I needed a heat source, like propane, but now I am not sure. I may only need to create bigger draft. I only have two small holes on the air vent on the SFB. I believe I need to make them bigger and add one more. You can see the holes in one of the pictures below. Any ideas?