I am on my 3rd time smoking with my WSM (18.5") and it is still too hot. I am getting temps of 325 and 316 a little over an hour after dumping the hot coals. I am using the minion method with RO lump. I only have 1 vent open 1/4 of the way (if that) and have the top vent wide open. I only used enough lit lump to cover the bottom of the chimney (about 1/5th full) and it is about 70 in the full shade, no wind. No water in the pan; I use the clay pot deal. I also am running it empty at the moment.