I'm not sure what's changed, but I just got back to my house and found that I had left the big bottle's cap off. The smell of that bottle was significantly different than the 10 mils or so in my pocket bottle which had been filled from the big one about 3 days ago. I put the cap on and shook it, and it seems to have gone back towards the funky smell, but more muted than before. Gonna let it air out another few days then compare it to the little bottle. Still tastes good, just not quite spot on.
I swear it's the Gamel Base. I got both side by side and smell and taste test reveal the base of Gamel in BB. I am not certain, but I don't remember the base tobacco as being like this (all my BB was practically a year steeped). There is definitely a funky taste to Gamel (though I like it), and now, BB. Vebra's "vinegar" adjective is the PERFECT description of the base flavor of Gamel and what I am getting, predominantly, from BB. The first taste that hits your palate is BB (or the other flavor), but it is overcome by that "vinegar" funk.