I'm sorry, I'd never even heard of it. But a question about 'Hillbilly Heaven' from someone called 'Jugband' makes me lmao.
So I looked at their website, and given the flavors they offer, I believe they're using TFA flavorings.
If you smell the just-opened bottle and get a little skunky scent from it, and if it's clear amber, it would be based on TFA's Coffee Clear.
If it's very dark, more likely plain TFA Coffee.
If it smells very strong, but not at all skunkish, and it's very clear
juice with lots of sweet caramel flavor, look to TFA Caramel Cappuccino. If that's what they're using, and you
vape it with too much power, it gives a burnt caramel flavor like Cracker Jacks. If you've tasted that note at all, it's a dead giveaway.
Does any of that help at all?