What the others have said. If you want to run less than 0.8 ohms, a mech mod with Sony VTC 4/5's will serve you better. Because at that low a resistance, the Hana is running at its minimum setting anyway, unless you set it above 26 watts.
To take advantage of a regulated mod like a DNA 30, try to build it around 1.3 - 1.5 ohms. You'll get much more out of the mod and the wattage settings will be more accurate, since you'll be able to vape it above the mod's minimum voltage setting.
If you are interested in learning what an optimum build is for any particular device, go to Steam Engine's website (
Steam Engine | free vaping calculators) and search for your mod in the mod range section. Try to build a coil at the mod's sweet spot. This is just a little below what would stretch the mod to its maximum voltage and give you a great range to vape on. From there, you can tweak your build up or down depending on your taste. But the sweet spot is a great place to start.