I am thinking of trying out a Boston butt for the fourth, something that I have been delaying to attempt given the time requirement. My question for those of you that have smoked a butt in 7-8lb range...should I add addtional wood after 3 or 4 hours, or just rely on the initial wood that I use at the beginning? I have noticed that my wood is pretty much just ash after a 4 hour smoke, so would this be sufficient for a 10-12 hour smoke? Many thanks!