Ah. OK, here's a couple thoughts...
1) Have you tried other juice delivery options? I totally stopped using "top coil," after NOT liking the taste from several Mini Nova types. I just don't think I ever got enough juice to wick up to the coil for great flavor. If you haven't yet, I'd suggest you try an EVOD. It's SIMPLE, and easy, and a LOT of people love the flavor they get.
2) If you HAVE tried bottom coils but don't like them, then MAYBE the T2 is having a problem like I have had with Kanger ProTanks. I find that when they're new, there's a metallic taste that I can ONLY get rid of by washing WITH SOAP. Not the coil, but the rest of it - I think it's got some kind of machine oil on it, that hot water or vodka soaking just can't remove.
Either way - it's sure to be the T2 causing it - hope you figure it out!!