You can run a BVC coil at 4.8 volts...it's about 12ish watts with a 1.7-1.8 ohm head...they can handle up to about 15-17 watts most of the time before they instantly start burning up. but if you're happy at 4 volts than there is no reason to run it higher...vaping is a very personal thing and it's all about what works for you
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@UncleRJ said, poke holes in the the juice intakes on the coil head to help them feed faster...also...when you go install a new head you have to let the juice from the tank soak into it a bit before you vape it....and waiting sucks I know. To help cut down on the wait time for use you can drip some juice around the inside of the top edges to pre soak the filler material (never down the hole in the center though, that's for air and it will flood and gurgle if you put juice in it) and put a drop on each juice intake on the outside of the coil assembly...that will cut the wait time down from 15 minutes to like 1-2 and help make sure the coil lives a long and healthy life.
I am glad you were able to get help and fix your problem and wish you the best and happiest of vaping...cheers!
