I leave one cap off and adjust with the ball valve and that works for me. I cook a lot hotter than 225 though - more like 270 to 300. My exhaust is 2" btw.
50" Klose BYC, 22.5 WSM, Backwoods Chubby, UDS, 26" & 22.5" Weber Kettles, Jumbo Joe, WGA, WSJ/MUDS, Jumbo Old Smokey, a piece of expanded metal I throw over the fire pit sometimes, Stealthy Black & Vol Orange
Displaced East Tennesseean
Proud recipient of a Tick
Former outlaw MOINK baller, now IMBAS Certified, but still lookin' over my shoulder.
"Relax, it's only BBQ.
" - Bigmista, 2013
Avatar by my son!