^ What he said. For sure.
I had airflow leakage a lot before I really understood the dynamics of this spectacular tank. My hypothesis was that the leakage occurred after I filled my tank each time (top fill). I find that even if you close the airflow before you fill, if you tend to overfill like I do, when you put the top back on it you'll probably notice that your fill line is lower after you screw the top back on. This is because the screwing of the top on after filling adds airpressure in the tank and forces liquid downward and a little leaks out of the wick and into the bottom piece of the tank (just below the airflow holes). So now every time I fill, I only fill it about 3 quarters full and when Im done putting the top piece back on, i hold my tank sideways over a paper towel to let that excess liquid out to keep from flooding and leaking. I also always try to keep it up right because no matter what condensation builds over time in the base of the tank. No avoiding that unfortunately. Also, if you use really thin juice, it can cause the coil to over saturate, or saturate too quickly, meaning the liquid will leak from the wick into the base of the tank. Another way I get rid of excess liquid in the base is to turn the tank upside down, wrap the open airflow holes with a papertowel and hold, then blow really hard into the mouthpiece. You should see liquid that has built up over time on the papertowel. Does the trick for me! After much frustration and being downright pissed off for buying what I thought was a piece of junk, I experimented until I found out what worked for me. And again, make sure all o-rings are secure and in the right place. So if you havent already solved your problem or gotten rid of the crown, give it another chance. It's a fine piece of tankage!