Ok.......went to "Paint" and tried to show how I do the wicks:
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This is how my wick spreads when I stuff it down the sides, fanned out. The "grain" of the wick is up and down, so the juice will go up towards the coil when you "pull" a vape.
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This is how most of the videos and suggestions from others is, down across the "ledge". The wick will get saturated with juice, but once you vape it, it takes a lot of time to get juice back up into the wick, partly because the wick is blocking the juice channels and the "grain" of the wick goes left to right, spreading the juice across the ledge and maybe up to the coil. You're pulling up the juice, but the fibers are making it go across the ledge first, in the meantime, giving dry hits or burning your wick in the coil.
Does that help any? I don't get the "juice suck" or dry hit/burning, and it works fantastic for the entire tank.
LEAKS: If, for any reason you have leaks, it's the o-rings, especially the one that the chimney goes up into in the top below the drip tip. You will have juice coming out of the drip tip when you are filling the tank,and also out of the air hole when you put the KFL upright.
Filling the tank: Hold the KFL at a 45 degree angle, semi upside down. Have the juice port at the bottom of the base. Don't fill it up entirely. While filling, this will indicate if the o-ring and chimney are secure, otherwise your juice will come out of the drip tip. After filling, secure the juice port screw, and tip right side up. You should see a few bubbles coming from the base if your have the clear (poly/glass) section.
And always make sure the stack and chimney are threaded down securely. If they aren't, the vacuum is lost, juice is coming up from under all the base of the stack and flooding up past the inner air port and coil. (And out your outer air port and up your drip tip) If you really tighten the whole stack/chimney onto the base, and it's hard getting them unscrewed from the base, put them in the freezer for a minute or two. Contracts the metal just enough to easily unscrew. I really tighten those 2 pieces with my fingers.