The 510 negative screw on my RDA was loose, ended up wasting so much time troubleshooting, and never once thought to look at it. Everything is working fine with that RDA, and it just seems like my velocity clone just won't work.
It's only doing that with one of my RDAs. My RTA with a notch coil and a tank with a Ni200 coil work just fine. I've taken everything apart and put it back together again.