I am cooking 2 9 lbs butts - put them on last night at 9 pm at 225 dome. After 16 hours, internal temp was 175. Took them off and double wrapped and put in oven at 300 for 2 hours. Now temp is 185. Why is it taking so long to get to 200 internal temp? This has happened to me before. Seems like my butts take much longer to get done than others experiences??