Been reading this forum the past few days and decided to try my attempt at smoking my first pork loin. Fat cap up, brined as per Tony's recipe and temp set to 220. Wondering about the need for a drip pan if the firebox and bottom of the smoker is foil lined? I went ahead and put the pan in, thinking it will be worthwhile to catch the drippings, but wondering if it is acting as a heat shield.