Did a little digging on the V2 last night.. Apparently its the single coil deck that is the problem with the JFC. Sounds like they didn't solve the problem on the V3.. On the single coil deck, there is no room for movement of the JFC. When you put it on and screw the tank down, it sits completely flush with the tank and deck, so there is no way to move it up or down. But on the dual deck, when all is installed properly, it sits property between the two orings and works fine. On the single deck, I was turning the whole top part of the tank, exactly like the juice control works on a KF4, but after watching videos last night and a couple of Reddit posts, this isn't how its supposed to work, the ring should move independently from the tank and base. I still got tiny leaks and weeping, and occasionally, it would wobble around, and you can even unscrew the base from the ring if you go to far. I ended up just removing the inner ring last night and now the single deck is working fine. Who knows whats going to happen when this tank runs out and I have to top fill it though.. Might just give in and finally try the dual deck when that time comes.. 2+ years vaping and still haven't tried a dual build, but I kinda miss the slightly bigger vape my Derringer gives me, so maybe that will be the key to it..