I am no expert on the Vault, I have only cooked on it a few times and for the 250 range, it was great and we barely used anything more than a couple dozen briquettes and a few hunks of wood. We also used lump, why wouldn't a daisy chain method work? Yeah I can ramp my UDS up and down too, but that's only because it's not insulated and you are right, you can adjust the airflow in massive ways. I would love to have a Safe for home use. That Vault is HUGE if you have to haul it in and out of a trailer for comps.
PNWBA - Hayden, Idaho http://www.facebook.com/BC2BBQ