I use CE3s. They're 2.4ohms. I don't have any burnt taste problems at all, although they seem to work best at around 3.8-4.2V. My guess is that you're having wicking problems, although with a bottom coil I don't know how that's happening. I run 100% VG in mine all the time without a problem. If anything should cause wicking problems, 100%VG should. Also, some juices just always taste burnt at higher voltages. What kind of
juice are you using?