I have the Chargriller Pro Smoker with side firebox. I was wondering if anyone had any success with mods to the firebox to allow the charcoal to get better airflow. As of right now its all stock, and after hours of smoking the ash buildup seems to be blocking some of the airflow to the coals. I have seen mods that pretty much place a piece sheet metal just above the slide out tray, and mods that are just basically a charcoal basket that you place unlit coal on the bottom and some lit on top. What are your success with this issue? Any suggestions?