I think I finally have the XXL UDS dialed in!! As everyone told me the doors were an issue. I ran a bead of high temp RTV around both door openings then sprayed the doors with pam and locked them shut. It is a good thing I checked the doors after a period. In case you were wondering, the pam doesnt work for crap.
Plan two, built a fire in the belly of the beast, latched the doors shut and periodically opened and closed them so they would not end up glued shut. The temps seem to run much more consistant and return after the spike from opening the doors. In the past if I opend them I would gain 10 degrees after coming down from the spike.
I am thinking tomorrow will be the rib test..
"Foil is a BBQ mans duct tape" my wife.