I don't really do dessert flavors much anymore, and I've almost completely moved back to tobacco flavors.
So even though the flavors I mentioned earlier worked for me, I haven't tried them in awhile so I'm not sure if they have changed.
Having said that, here are the answers to your questions, as best I can remember...
--The Tastyfinger tastes more like a Reese's than a Butterfinger, and the difference might be a lack of butteriness
--The Apple Pie isn't really buttery to me, unfortunately, and I would say I don't really taste much crust either
--The caramel popcorn used to be my favorite, but I never noticed any saltiness, although that would have been really nice
Sorry that none of those answers were what you were looking for.
I've never tasted any juice that I would consider buttery or doughy tasting.
However, Kick Bass Vapor does have a caramelized cappuccino that is a bit salty, and it is one of my favorite coffee flavors for that reason.
And as a side note...
One of the big issues with buttery flavor is that diacetyl is a common ingredient in butter flavors.
But diacetyl has been removed from most juices because it poses a potential health danger when inhaled.
No worries. It may not be the answers I wanna hear, but at least it does help me gauge whether I should order them or not. Thanks for the diacetyl warning. I am aware of it, and usually make sure the places I buy from don't have it. The one buttery vape I've had is BWB's Waffle, but it's only buttery for the first couple weeks, then the syrup tends to dominate the flavor profile, so I haven't ordered it in a while. I wish that buttery flavor would stick around past a couple weeks.
Some good salty vapes are Line Rider from Nite Lite, which is their 555, and the buttery popcorn from Vapor Room (with extra flavor; it's way too light without it)