This is my second time to use my MES. Yesterday I put two small chickens and a rack of baby backs on it. Set the smoker temp at 275 (max for MES). The temp only got to 250-260 the entire time. Today I have 4 1/2 racks of baby backs. The smoker temp is set to about 260-270. The smoker temp is only getting to about 210. That's with the damper open about half way. When it's closed that's the only time the smoker temp rises. It's about 50 degrees here with not much wind. Any ideas why it won't heat up more? Is this how the MES work? Any thoughts are appreciated.