i have tried a few after similar forum chatter. im betting my system is just fucked from running overloaded GVW on a tune.
i have tried bulk fill, walmart, or Fleet pride with same result. i refuse to run mopar at the 10X cost. i also use about 3X more than the brotow rigs on most forums with 2500s and dubs. I have a DEF test kit that i carry in the truck, i have never tested my tank out of spec.