I have been cooking on an offset for a few months, got me a WSM and have three racks of ribs on right now. I got the temp up to 275 but it is slowly going down and is now at 215. It's been on for just an hour. I had to open the lid and take off both grills to add more charcoal and then put them back on. I don't understand. I thought that the WSM holds temps. Please help.
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