jumpinjoe
Hellcat
Someone up above hit the nail on the head when he said something about how long the roast is under smoke. It's also important the amount of smoke during that time. And mesquite is the absolute hardest to control with certain meats.
Most meats will stop taking evidence of smoke internally when the outside reaches about 139-40 degrees. So most smoke after that outside temp will just lay on top in layers and build up a bitter bark. The temp during that time will also have an effect on it. And try to maintain a really faint pure white smoke. A dark, heavy smoke will also lead to some bitterness.
It looks like you're off to a good start, but if it's a little heavy on the smoke, try not adding anymore wood after the meat reaches about 140 degrees. If the cooker temp is about where it should be you'll be fine till the internal is around 125-140 for a rare to med rare. Good luck!
Most meats will stop taking evidence of smoke internally when the outside reaches about 139-40 degrees. So most smoke after that outside temp will just lay on top in layers and build up a bitter bark. The temp during that time will also have an effect on it. And try to maintain a really faint pure white smoke. A dark, heavy smoke will also lead to some bitterness.
It looks like you're off to a good start, but if it's a little heavy on the smoke, try not adding anymore wood after the meat reaches about 140 degrees. If the cooker temp is about where it should be you'll be fine till the internal is around 125-140 for a rare to med rare. Good luck!