My rda works great as long as i back it off a hair from bottoming out the connection, the god180 does have a divot in and my tank has a spring loaded pin the is about the same size and may be the cause. As far as coils the tank uses premade block style coils, which i did just change, so im going to try a new one. I havent had any problems with the ohms moving around either. Its fiers great then randomly gives a short message, then i hit the button a few times and then it starts working again.Its just an annoyance more than anything. I hate spending all that cash and having little issues like this.