Just my 2 cents.....CHECK YOUR BUBBLES! I've had endless leaking issues on mine. The first build went great, after that, I must've wasted about 20ml of juice on this damn thing. I put in an unbelievable amount of cotton, and still it was leaking I was on the verge of returning it, but I'm a problem solver, and it was driving me nuts. So I put in some thick juice, possibly 90/10. And then I noticed it..bubbles coming from the bottom and top of the chimney. Replaced the o-rings....but still it leaked. I then used some other o-rings I had (not sure from which RDA/RTA), and BAM!! problem solved.
In case you're wondering, yes it is an authentic Mage...so not sure why I had the o-rings issue.