Thanks! I also neglected to mention that my coils also randomly taste burnt. I also use a KangerTech EVOD tank on my iTaste and both that and my BDC (both with new coils, less than three days old) taste burnt at various settings. I was told to give the tank a quick three-quarter turn at the base to introduce air to the liquid or something. It does work, but I think that might also be a very big part of my leaking/gurgling problem
I'm lost on the 3/4 turn thing, it almost sounds like they're
trying to flood the coil due to the eliquid being thick. It might work, but yeah that's a recipe for flooding/gurgling.
What you're most likely describing is a dry-hit, or an inability for the wicking to keep up with your eliquid as they're vaped off the coil. Those are 60% VG eliquids, and evods and BDCs really aren't made to keep up with them. With the evods you can do some tricks like removing the flavor wicks to help, which usually works at 50/50 but you're pushing it.
You can search the forum for dry-hits, but probably going to need to lower your voltage further, tighten the air-control if possible, use primer-puffs between hits, and suck very hard as you draw. You can also add a few drops of distilled water/vodka to the tank so it'll flow better.
Something like a subtank nano or delta II can handle those eliquids much better. BVC were stated as an option, but I'd suggest looking into the safety issues before you pick them up.