Are there any publication's that goes through the do's and don't of coils and wicks and all the different possibilities? Like the different coil wire materials (kanthal, stainless steel, nichrome, titanium) how the thickness, the inner diameter of the coil winding, the amount of loops (5, 6, 7 etc...) effect whatever. Then the wick material (Cotton, Rayon, Hemp, Silica, etc...). How it all plays out to make a discision of where your headed in your project. I have thought a RTA would suit my needs better than an RDA but from there........? Now I'm just using two Kangertech Subtank Mini's with 0.5ohm coil heads. One on a Kangertech Kbox Mini 50W and one on a Innokin iTaste CoolFire IV 40W. My new baby is a Sigelei Fuchai 200w TC Box Mod with a Sense Herakles Plus 0.2ohm. All of course take factory produced coil heads, any and all advice welcomed. Have been vaping about 6 months now. Started with a Vue then the NJoy battery with a Kangertech 1.5ohm tank (forgot which one without checking) Thanks to all my fellow Vapers. Glad to be free of those cigarettes Amen!