I found this article while struggling with vaper's tongue a couple of weeks ago.
http://www.ecigarettedirect.co.uk/ashtray-blog/2014/03/vapers-tongue.html
I see you are past it, but it can come back in varying degrees. Usually when my juice goes flavorless on me, I switch up juices. A few extra tanks and/or a second device will do wonders. I also hated menthols when I smoked, but I did get some Black Ice menthol and it tastes good and was the only thing I could taste during my extended bout with vaper's tongue aka "53 hours of hell". Since then, I also started making my own coils for all my Protanks and man, the flavor is so much better. So good, as a matter of fact, I am seriously tempted to blow my budget again by going RBA and a mech mod.
Now for my sinuses to clear out 100% so I can finally fully realize the power of vaping.
Not likely. Damn allergies. I hate cats more every day.