I also had the same leaking problem. Tried a lot of the suggested ideas, but the one that has worked the best so far, really surprised me! All I did, was take lighter draws. It has worked all day today, into the night, as I am typing this. Not one leak. What I noticed when taking lighter draws, is that I no longer hear the gurgling sound that I used to hear. Whenever I heard that gurgling, I would take off the tank, and the atty would be flooded, causing it to leak. Now, I only hear air being sucked in, and I haven't flooded my atty once! I did order the silicone caps though, just in case this was just a fluke.