I got the same impression from the vanilla. I thought maybe it needed more steep, or a different percentage. So far it just tastes like butter. I got the mocha flavor too, and it mostly tastes/smells buttery. I thought at first that I might have made a mistake and mixed the same flavor twice. Nope, they're different... but both buttery. I tried the SC vanilla too, and just don't get vanilla from it. Not butter, but not vanilla either.
I've been very happy with Hangsen and SC tobaccos, but I think I should just stick with that. Aside from Hangsen espresso I can't think of a non tobacco flavor that has worked out for me.