DeadKaiser, Thayamax: Unless ya'll got one of the famous "China QC Specials" that I see people complaining about from time to time, then it has to be wicking, it just has to be. I know that with mine for some unknown reason, I went away from closing off the juice flow control ring during Re-Filling and I got leaking sometimes (just 1 drop looks like a flood on this thing), but as soon as I started to close off that control ring again (along with the airflow control) then the leaking stopped. Just keep working on it and things will come together for you. I have found that my coils can look pretty nasty sometimes but they will work good enough, but if the wicking is not right in some respect then it will either Dry Hit or Leak. Learning to wick my Lemo's was trail and error for several months for me, and this Cthulhu is even different yet. I don't think that this is a Starter Type RTA for someone fairly new to these types of devices. Even with months of experience on my Lemo's I am still experimenting with the wicking on this trying to get it nailed down perfect. As Red Green would say " I'm pull'in for ya, We're all in this together".
Edit: I use 3mm coils and a 7-8mm wide strip of KGD, and vape from 15-25 watts and airflow from Tight to Wide Open on the Single coil deck ONLY.