I do just about the same. I use wood chunks that I bury high in the mass of charcoal. I use Kingsford too and follow the tightly packed idea of the minion method. The 18.5 is more of a fuelmeiser with longer burns but the 22.5 behaves the same. If you have a lid thermometer get the unit to about 250 on the dome and shut all the lower vents to just a crescent and leave the top wide. it should settle at 275 and run there 6-7 hours.
WannaBeBBQueen's Prince Consort
Swamp Pit BBQ's freeloader
To part or not to part: that is the question. Whether ‘tis nobler in the mind to part and suffer the slings and arrows of ostentatious brothers or to not part when faced with a sea of dissent, and by compromise end it? To part: to succeed. Forever more: and by succeed to say we win.
Yeah it looks good...but how does it smell?
Member of The Big Guns BBQ Team Semper Fumantem
"you're eating tree RAT, tree RAT, you're eating RAT!" -- landarc