Just wanted to update this thread with some things that I've found, in case anyone else buying a DNA 20 or DNA 30 mod has any of the same questions I had when I first got the device.
After about a dozen builds and a week of experimentation, I've learned how to properly harness the power of this device when using dual coil setups. I went from thinking it was under-powered and incapable of being my all-day device, to using it pretty much exclusively.
I learned that in order to get a high quality vape with a dual coil setup, you need to wrap very small inner diameter coils. Smaller diameter coils (1/16" ID or less) tend to be much more efficient on this device. If I build, say, a 1.2 ohm dual coil setup and the inner diameter is 3/32", it's gonna produce less vapor and be less efficient than a 1.2 ohm dual coil setup with a 1/16" or smaller inner diameter. Obviously this is all SUBJECTIVE and MY OPINION only, but it defintely seems to be the case.
Also, I find that 1.0-1.5 ohms is the definite sweet spot on this bad boy (with 1.2-1.4 ohms being PERFECT), which is great for flavor chasers, because with dual coils you can get a whole lot of surface area at 1.0-1.5 ohms. My absolute favorite setup is an 18 wrap, 1/16", dual micro coil build with 28g kanthal. It heats up fast, gives great flavor, and can go toe-to-toe with most moderately sub-ohm mechanical mod builds, in MY opinion.
I've also found that "super nano" builds, or coils with an inner diamater comparable to that of a 26g or 28g syringe needle, hit EXTREMELY hard on this mod. I had to drop down 10 watts to comfortably use it.
Basically, I've found that the smaller the diameter of the coils, the more efficient the build. If you're looking for a more dense & cloudy vape, try wrapping around your super small bits. Keep your resistance between 1.0 & 1.5 ohms (again, I find 1.2-1.4 ohms is PERFECT), because this device shines around 6V, which is about what you'll get with a 1.2ohm setup at 30 watts.
Again, everything I've posted is MY opinion, and is subjective. This is just what I've found works for ME.
Hope I helped somebody! Happy vaping ECF!
Oh, and here's a picture of my current (and favorite) build. Dual coil, 28g Kanthal, 1/16" ID, 18 wraps, wicked thru the coils & on a cotton cloud (used Japanese cotton pads, would highly recommend them) in a Vulcan RDA on my Hana Modz DNA 30 box.
