I've not had good luck with small briskets either. I'm still learning, but I just don't think there's enough substance there to achieve a good cook with a standard approach. Luckily I got a meat slicer so I can "save it" by slicing thin and adding beef broth. makes for some great cheese steak sandwiches anyway.
UDS, Akorn, Weber Red Head Kettle, Drum Grill, Gasser w/cobwebs all over it. I'm JD.