I have a new pro series 1100 from Lowes with the latest controller. Smoking St Louis style ribs. Set temp is 230 for 3 hours. Then 250 for 2 hours. The 3 hour segment seemed to work. But at 250, actual temp ran 270. Bottom grate temp in mid back of grill ran 180-196. Meat probe temps never increased past 155 - 160. Removed foil. Same thing. Upped the set temp to 270. Actual temp running 285. Grate temp at 225. At the 5 hour mark with unfoiled ribs at 179. This is very difficult to control. Any ideas?