it's really important to remember, do not use really thick juices with these unless your going to do some modding to these. I made my own 100% VG juice that was really thick and it had issues moving up to the coil. I ended up charring the wick really bad and now this one tastes really burnt ever time I don't let it steep for a few minutes before taking a draw. I had the same problem with a really chocolaty juice
if you cut that 100% to 90% even if you use distilled water you will have much better luck with wicking