Just got the little guy a few days ago, did the fire pan mod, and was smokin in no time!. Didn't have many problems keeping up temps but did have a layer of what looks like fine ash on the top of my pork shoulder after 4hrs. The sides and bottom looked great, but the top looked almost blackened? I'm thinking I added too many wood chips throughout the process, would that be it? I was adding a handful of wet and dry Jack Daniels chips every 30-45 mins or so. Any ideas/tips?