I have a modded ecb smoke n grill that will maintain 220-250 for 10 hrs straight using the minion method using briquettes. Today I smoked 2 slabs of spare ribs and a 5lb butt. The ribs were smoked on the top grate and the butt on the bottom grate. I started at 9:45am and the ribs were done at 4pm using the 3 2 1 method and were excellent. The butt was at 140 at 4pm and reached 145 at 6pm. I had to move the butt to the oven because we were eating at 7:30. Any reason why a 5lb butt after 8 hrs would only be at 145?? I've always had great success with ribs and turkeys but the butts always get stuck in the 140s and never rise. It's not like I'm smoking a 10lb butt, just a small 4 or 5lb.