Watching BBQ Pitmasters last week I saw that Johnny Trigg placed his butts in an aluminum pan. Now this method would certainly keep his pit clean but how does it help cooking the butt? I do not pan nor do I foil. I'm going after the most bark possible. (Just finished a 17 hour cook with two butts, 8.5 & 9.25 lbs...wow, good stuff) All that being said, do you pan your butts? If so, why?