I have the Charbroil Silver smoker with the mods made and I am smoking ribs today. I am having a problem with the temperature though. I am using Rancher Hardwood Charcoal and after lighting it, with everything wide open, temp went up to 280 after first 15 minutes. I closed the air controls (top and bottom) half way and it dropped to 260 after next 15. Since then, with everything fully closed I can not get it to drop below 250 and its been an hour and a half. My target temp is 220-240. HELP! Should I have immediately started closing the intakes once temp went over 240?