Was it by chance an "Enhance But"??? They can act strange and IMO be lacking in flavor. As to the meat tightening up it needed to cook longer and for you once again I shall kick the dead Pony"YOU CAN NOT COOK GREAT BBQ ON A CONSISTANT BASIS COOKING TO AN INTERNAL TEMP OR BY XXX MIN PER LB" Probe tender, Bone wiggle, Bend Test, are the most reliable means to determine properly cooked Great BBQ.
I never met a Cow that I didn't like with a little Salt & Pepper! Certified PORK-A-HOLIC