I have kind of a similar issue. But only after re-coiling these things. I use 3MM silica wick, then take it and put 2 strands of the 3MM silica on top, looks exactly like the factory build. Tests at 2.1 ohms no problem, place cap back on ensuring wicks are aligned properly. Fill about 60% full, put head on, seems to not leak, take a primer toot gently, then fire, good taste and then.. eliquid all in my mouth. I have tried with 6 different heads. The second I do anything other than screw a fresh one into the base I get flooding. Using all 65/35 eliquids so it's not too thin by any means.
It's frustrating to say the least since I really just want to vape, but the flavor is not there with the Evod or protank specific heads that I'm getting out of my Vivi Nova which I've rebuilt 50+ heads for and all have worked perfectly.
It's Frustrating because It's my favorite looking tank, other than my RSST/AGA-T2 and vapor production is great with it, just low flavor and I can't muck about with it at all!