I seasoned my chargriller using the SFB this sunday and I was only able to reach 250* for a couple hours and my intake and stack vents were wide open. Shouldn't I be able to get it hotter running wide open? I was only using 2 chimney worth of charcoal since I only needed to run it a couple hours. I'm sure I'll run into major fuel problems when I go to smoke for the first time and all I can acheve running wide open would be 250? Any advice on how to maintain 250 and not burn out in a couple hours?