Yeah, you really have to rotate flavors. If you vape too much of one thing, you'll stop tasting it. Happened to me with butterscotch. While I still love butterscotch, I rarely vape it anymore. It's more of a treat, really. A few puffs of butterscotch every once in a while, and then I put it away.
EDIT: Also, even if you hate menthol, you should try finding a menthol you're okay with vaping. It can act as a palate cleanser, and is a godsend if you ever get sick with a cold.