To answer every body, after I drop my coals in I leave the middle section off for a bout 10 minutes to let everything get going. I leave all my vents wide open till I start getting close to my target temp (275*), I then start shutting down 2 vents to about a 1/4 open. Top vent is always wide open. No water in the pan, just foiled. The temp on my digital which is at grate level, is reading 305*. My digital is accurate within +/- 2*.
Modified Char-griller w/sfb, red char-broiler vertical, 22.5 Wsm.