I didn't read the entire thread (sorry) since my experience will be different from most since I quit smoking 14 years ago and there's no question that my taste buds had already adjusted when I started vaping a few months ago. Since you haven't smoked in 2+ years this might also help you.
My first setup was an eGo Twist and a Mini Protank 2. When I first tried vaping it was great. I was sold. Everything I loved about smoking (PLUS flavors!) and nothing I didn't. I bought some great juice when I started, like Five Pawns.
Fast forward a week and I. Am. Not. Happy.

I can't taste anything anymore. Nothing tastes good. Everything tastes the same or tastes flat. This sucks. That went on for a couple of weeks, with me miserably chasing that flavor dragon trying to get it back.
I stepped up to a Provari and a dripper. HOLY COW. What a difference! I could taste EVERYTHING. Stuff that was just okay when I vaped it before was suddenly amazing. Instead of Gambit tasting faintly apple-like I could taste the apple, the vanilla ice cream, and even the pie crust on the exhale. I still have trouble with clearomizers and some tanks. I sample stuff at vape shops still, but I usually ask if I can drip it. I just can't taste anything in carto tanks or things like Protanks. Eventually with the Provaris I settled on my favorite toppers (the Dripper Pro if I want to drip and Sophia if I want a tank; I recently acquired some mechanical mods and use a Kraken and a Brass Monkey RDA).
Since I upgraded my gear, I have never had the problem where I couldn't taste anything anymore, and that was months ago. I can vape the same juice for days, or rotate between several and all taste awesome. But I still can't taste well with clearos.
So I'm going to suggest looking into upgrading your gear; look at it as an investment. Granted, you will might to learn how to rebuild coils but it's not that hard (I promise). Or if you really don't want to rebuild, you can probably find a vape shop near you that will do it for you. But for me, the gear made EVERY bit of difference. Yes, it will cost you some money - but I bet it solves your problem.
Also, I highly recommend checking out Craft Vapery (I am not affiliated with them, just a customer). They are a curated subscription service that sends really high quality juice to you every month based on what you like and dislike. They are a fun way to check out new juices and they work hard to make their customers happy. They are MUCH MUCH better than anything you'll buy from Fasttech, all very high quality brands. There's a thread about them here:
http://www.e-cigarette-forum.com/fo...ry-curated-personalized-e-liquid-service.html
Good luck, I really remember how frustrating it was to not be able to enjoy vaping.
