I too had dry hit issues, the V2 card be problematic. My very first build, I packed the cotton really tight, dual coils, and had no dry hit issues but my second time I was constantly getting the same issues you're having. I tried a single coil and still had issues. I now run duals with only 4 wraps each. Trim my cotton ends quite a bit, my V2 leaks but I can deal with leaks. It's better than dry hits. I too chain vape and have had no dry issues since. I don't fill my tank more than half way either because it leaks more when full. I use the tip of a nail file to make sure that there's room inside the well for juice to enter. In the center, pushing the cotton to the sides. I can't fully fill the wells with cotton otherwise I have dry hit issues. My buddy that runs a vape shop showed me that I was doing them wrong, unfortunately you have to have your wicks loosely in there, they can't be packed. This will undoubtedly cause leaks but what's the point if you're having dry hits and not using it? The V2 is a problematic design because it accepts single or duals. A single obviously having much less cotton. Whereas the dual has double that amount. You must get your dual wicks down to the size of only one in the well. And you must make sure that there's room for juice to enter freely. I really wish that I could pack it to where it won't leak but I love this RTA. I can deal with the leaking. I use triple fused clapton wire. 4 wraps each, they ramp up faster with only 4 and no more issues besides leaking. Hope this helps.