Have a new BBQ Guru DigiQ II temp control and plan to cook two Boston butts overnight in a couple of days. Can anyone offer advice on cooking time, temperature, etc.? The combined weight of the two butts is 15.2 lbs. Should they be placed on the grill directly over the fire or on the elevated grill using the plate setter? I've successfully cooked a couple of butts before, using the plate setter, but without the 'low and slow' DigiQ system. Any comments/suggestions appreciated.