Congrats on discovering electronic cigarettes! I too cling to my preferred menthol, though it's not as if I haven't tried other flavors. I guess being freed from the limited taste restrictions imposed by cigarettes encourages vapers to enjoy many different flavors.
I find that even though my "go-to" juice is the fresh, clean taste of Halo Menthol Ice, switching occasionally to a different flavor refreshes my taste buds, allowing me to appreciate my favorite that much more.
Even at that, though, I never venture past one or two alternate flavors. But after experimenting for almost 4 years (I'm 55, by the way), it's very apparent that the one remaining aspect I've carried over from smoking ( beside the hand-to-mouth ritual) is "menthol". Whatever I vape must have a noticeable menthol base. With that, I find that adding menthol to a coffee or vanilla juice improves the flavor for me. I've yet to find a coffee or vanilla, though, that's satisfying enough for me to commit to.
Anyway, keep it up...a pleasure reading your post.