Scott, when you line the floor of the smoker with foil (not the wood box, but the actual floor of the smoker), are you remembering to take a pencil or something and poke the drain hole in the foil? It is actually easy to forget to do that, and it would restrict air flow causing your wood not to burn, which is what you experienced with your tri-tip, and your 4.4 ounce hickory test if I remember correctly.