Butterfly it, essentiall cut the backbone out of it, and press it flat. Here's some stuff I've just learned, soak it in italian dressing for a couple of hours, apply your rub as your putting in the UDS. The soak should help for the moisture, don't go more then 2-4 hours on the soak, smoke it for about 45-60 minutes per pound until you get the desired temp you're looking for.