I have genuine Kanger coils 2.2 ohms in the head originally and 1.8 ohms that I purchased separately. They taste bad only for the first couple hits. I think it's probably a manufacturing residue on the wicks &/or coil but it goes away very quickly and I put them on straight out of the package. Also, after watching several coil rebuilding videos, I suspect that the wire on our factory coils may not be annealed yet and some even mention torching the silica wick before using to burn off manufacturing residue.
Have you tested the same juice in a different delivery system or at different voltages? My fruit juices don't taste bad at 3.2 volts but do seem to taste better at 3.6 but menthol will scorch at that point on a 1.8 ohm coil. I accidentally turned my eGo-C Twist all the way up (it was dark & I was driving) on the way home earlier with my Strawberry Pineapple vape---it wasn't pretty! New 2.2 ohm factory coil and only for one very painful hit so my liquid survived the shock--my throat is still recovering--but it was definitely a very bad experience.