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i am thinking you may be a lot hotter than you think. your below 1/2 hour per pound. i have done fast smoked briskets that turned out pretty good. so don't worry. can you check the meat thermometer? boiling water or ice water test? if not use a tooth pick. poke it in several places. when the temp says it is done. if it is hard to push in or pull out a tooth pick it is not tender.
it could be the meat probe.
225 to 250 should be good. glad you found your proble. it will still be good eating.
something to remember.