I have recently fixed up a 26" Bar-B-Q kettle and have used it on three occasions. I am trying to get a feel for how much charcoal to use to maintain 350 to 400F for 2 hours. Also, what damper settings to apply to the three daisy wheels. I have used 1 full chimney of Kingsford briquettes and have struggled to maintain 350F for more than 30 min. starting with dampers between 1/3 and 1/2 open. Any help out there from fellow 26" kettle owners with more experience?