Personally, I really enjoy MBV juices. However, they need some serious steeping in my opinion before they stop tasting like perfume, haha! MBV is a great site to order from and again, I really enjoy some of their tobacco flavors. However, usually I give them at least two weeks to steep before I try them. I don't do anything fancy. Leave them with no cap on for a week or so, shaking them every so often. Then put the caps on and shake them.
the other thing I do is shake them up before I use them. Then I shake up the cartomizer after I fill it with them. Hey, they might just take time to steep, but now I have a system!