[PJ]

Check that you're not on temp control mode with a kanthal coil? Or if you've accidentally fired it on TC?

Other than that... Maybe your coils aren't primed properly? Once you burn the cotton on them, the burned taste is going to always kinda be there, even if the cotton on the outside still looks white.

With these newer tanks you need to overdo the priming like crazy because they use so much cotton. I soak the hell out of the coils as much as I can, fill the tank, leave it overnight, and the next day I close the airholes and suck. Probably overkill, but fuck, tfv4 coils come out to like $5-$7 each. Rather do all I can to prolong their lifespan.