I have about 15 EVOD's that ive been using for the past few months as well as a Pro tank that ive used for a few weeks. All of them seem to have the same problem. They flood, gurgle, and leak from the bottom. I've replaced the coil heads atleast twice on all of them, and I only run 70/30 and 60/40 PG/VG Mixes through them. I've turned them upside down, let the juice in the center tube come out completely, unscrew the base then re screw it back on. This alleviates the problem for a few puffs, but then it just comes back. I've heard people say that this issue occurs when the tank gets down to about 1/3rd full but i have these issues even with an almost full tank. I never remove any of the extra wicks (I have before, which caused them to flood and leak even more). Anyone have any idea what the issue is? I always make sure that the center post of the head is pushed in all the way and that the silicone cap sits right above the wicks, and i always make sure that i tighten the head into the base before i reattach it after a fill.