I've been using the Protank 3 for about a month. I'm vaping Backwoods Brew Backo at 4.2 volts with my Smoktech Winder VV battery. Tastes amazing when the atomizer is new. After about a day, I start getting a burnt taste. I opened up the atomizers and they all have a black residue around the coil. Clearly burning. I've tried multiple other e juices (Halo, TW, Johnson's Creek, etc.) with the same result.
Am I doing something wrong here?
Am I doing something wrong here?