First off great thread, and I am watching closely. I like to load N/S in the Rockland, I find I can fit more in, no rolling logs onto the glass, and given that I cram more in there, I can extend burn times. A fully loaded box, from 250F temps loaded at night, runs up to 800F and back down to 250F in around 8 hours MAX with coals left to light again. This is using red oak mostly. I do agree too much air gets in the box, and the primary air adjustment doesn't matter. I grinded off the bump stop last year, and unless you add tape, the primary air is still open a good 1/2" if memory serves correctly. Haven't played with doghouse holes.