Perhaps you just got a bad batch of coils? Your taste buds seemed to be fine until you changed that first coil, so that seems kind of weird it would be VT at that exact time. Your first coil tasted bad at the end , same as the other 2, so perhaps those are bad as well? You then used those coils in another tank, so i doubt your first tank is not wicking correctly.....
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Sent from my SM-G960U using Tapatalk