Today I started the 3 Butts for the block party. 16.8 lbs. total. Last night I rubbed them down and set in the fridge to get happy. Naked all rubbed down In the smoker at 0700 4 hrs in to the smoke. smoker temp. 230 - 235, internal temp. 155 & 156 Is there any reason to keep smoking these after say...int.160*?