Just finished pulling a brisket off the WSm and final results were fantastic. However, had a long, tough day keeping the temp up. Did everything I usually do, almost a full ring of charcoal with a lit chimmey on top. Though was the first time using Royal oak lump. had the vents full open and still was having problems getting over 200 degrees. I actually had to open the door a few times and leave it open to keep the temp up. The only unsual was that it was an absolutely humid day with no wind whatsever. Anyhow, anyhow got any ideas what I was doing wrong or what I can do in the future to hwlp with the low temp problem?