No problems getting 350* with my 22" thus far; no water in the pan. I use Royal Oak briquettes and a couple pieces of lump. You can crack the lid or manually blow air via a handheld fan through the vents.
Peace and Smoke,
My Weapons: Custom rig - Kandi, UDS; Bubba Keg; 22.5 WSM x 2; 18.5 WSM; BWS extended party; BWS Gator and an Onyx Oven; 29' ft Coachmen Leprechaun (Lola).
Dan Chambers get well soon, so we can tell you to "Shut up Chambers"