Is this for KCBS? I think that muchs sauce on brisket isn't the way to go, you'd be better served using a jus or just a quick finishing sauce to give it some sheen. Brisket more than the other meats is focused on the meat itself, rather than the interplay of meat vs sauce.
Other posters nailed it and you knew as well that the brisket was overcooked. For presentation purposes you probably want to make sure that the brisket is trimmed slightly wider than the box when it goes on the smoker, so that all slices will be the width of the box when it is sliced.
Other than that it looks delicious! Was it slightly dry due to being overcooked, or did the phosphates in the Butchers injection keep it moist for you?