Not all flavors are created equal, and as I guess you've found, they do taste different when vaped. I've had pretty good luck "layering" chocolates, to get a nice, rounded flavor, and I usually throw in a tiny bit of caramel with it. It's a mix I enjoy.
Also, combining chocolates with a condensed milk flavor is going to give you a rather nice chocolate milk. Chocolates do take some playing around with in my experience, but I like the flavor so I'm happy I have some to experiment with.
Chocolate mint goes great with a little extra chocolate on top and a tiny bit of sweetening in my experience, but since it's your palate, you'll have to play around some and find a chocolate "flavor mix" that you enjoy.
Best of luck,
Anna