Like Ezgoin said,some of the Texas/Oklahoma sauces should work.
My old neck o' the woods,west Ky,west Tn,Memphis might fill the bill.
If the long thread on forum sauces is still around ,you might be able to pick from there.
Another option is to pick a commercial sauce that might start and cut it with black coffee,,or losalt beef broth.
A little apple juice,or a little cider vinegar could work.
Original/mild Cookshack is used by a lot of comp teams and very successful on the circuit.
Just a couple thoughts.