One thing I did notice, the flavor (in this case) has a lot to do with the level of nicotine. I ordered Vapor Kings Vanilla, by accident @ 18mg. It has been steeping for a week. However, I just couldn't get that much vanilla flavor, due to the nicotine level. I mixed just a bit in my clearo with my Apollo's French Vanilla and the flavor changed to the bad side. I'll give Vapor Kings Vanilla another try with a lower nicotine level.
So far, all my other vanilla flavors were @ 11mg (1.1%) to 12mg (1.2%) nicotine. In other words, any vanilla flavor above a nicotine level of 12mg won't taste good (IMO).