Have a Large BGE and decided to try a whole chicken for the first time. Injected it, added rub, set for 1hr, placed on 'chicken stand' with beer in it, and set to 280F. It's been 5hrs and is only 160F. Understand I'm close, but this thing is no bigger than 5lbs. I've opened it probably 7-8 times over 5hrs to spray a quick marinade. The pit and meat temp have been verified from multiple therms so don't foresee a tool issue. What am I missing?