Have you had the other similar ST beers like Mokah or Chokolat? I like them a lot, but they are pretty sweet.
I've always heard it speculated that Southern Tier uses sugar in their beer, and I agree that their bomber offerings are always sweet. I remember when they released Farmer's Tan in 2010, their now infamous 9% "Pale Lager". It was just absurdly sweet for the style. Around the time they started really expanding their lineup in ~2010-ish, their beers started becoming increasingly sweet as they expanded distribution.
Also, unless things have changed recently, Mokah is just a blend of Choklat and Javah. I've never really been a big fan of Javah (and, by extension, Mokah), but Choklat itself has always been great. YMMV.