Interesting...I've had similar experiences, but not to the same level as it seems everyone else. Granted, my first fill leaked like a sinking U-boat as I hadn't tightened the juice control all the way; but since then, it appears under control with only an occasional air-cooled VW level of leakage. So far I've only run the velocity deck with the coils that were included (I was too excited to build, and wanted to get it running) which come in at 0.33Ω...and its been a great vape so far through three tanks. Though I have to agree it's a fiddly tank with a steep learning curve primarily owing to the juice control ring...even after figuring out to close it when adding juice, there still seemed to be leakage particularly around the upper o-ring...nothing serious, and just a level of juice costantly under the tank between it, and the mod..just a small amount. I don't know..perhaps in all my excitement I'm really willing this tank to work, and mentally glossing it over. I'm planning on a disassemble this evening and giving the single coil with a TC setup a go, and see if I eat my words.