If you are a brand new vapor and recent ex-smoker, your experience is not too surprising. Years of cigarette smoking has damaged your taste buds. They'll heal over time, but until then your sense of taste will be impaired.
Dry mouth can contribute to one's inability to taste, and the e-liquids that we use (both Pg and Vg) tend to pull water from our lungs and contribute to the dry mouth. I suggest to drink PLENTY of water throughout your day, especially while vaping. Stronger flavors such as menthol, mint, and cinnamon may help in the beginning. (Cinnamon and citrus flavors can melt the plastic in many of our juice delivery devices -
http://www.e-cigarette-forum.com/forum/blogs/baditude/3733-6-something-safe-cinnamon-citrus-flavors.html
Also exhale some of your vapor through your nose. Our sense of smell can assist our tongues in recognizing the flavors in our vapor.
It's my opinion that your inability to recognize flavor has less to do with your juices or equipment than it does being a recent ex-smoker with damaged taste buds.