I got my first Protank II on Friday and the store I bought it from assembled and filled it for me before I left the store. Everything was fine until it was time to refill. I'm changing flavors a lot since I'm just starting so I have been taking it apart to rinse before refilling. Now, when I put it back on the battery if I screw it all the way down, it's not making a connection. If I back it off some, it will fire. But the amount I have to unscrew it varies and sometimes it's so much it feels loose. I've noticed that if I reassemble it a bit looser, that helps but I am afraid the thing is going to come apart and dump juice everywhere. I'm also not getting much vapor at all. The coils are 2.5 and I am using an ego twist set at about 4.0. Any higher than that and I get a burnt taste. I really want to like this tank but I'm getting frustrated. What could be the problem?