I have the DNA 30 as well. Nothing unusual, 30 watts is a big drain. There's the voltage supplied to your coil(s), plus losses in the electronics that take the 3.7v and increase it to whatever voltage is necessary to provide the desired wattage. IMO the DNA 30 is OK for higher ohm builds, but if you're driving sub-ohm loads, you may be better with an 18650 directly driving your coils. For a .5 ohm build I use a mechanical mod. I get better battery life, and it's a snap replacing the battery. 1.6 ohms and above I use the DNA 30.
For the same wattage you can have a low voltage and low resistance, or a higher voltage and a more resistive load. Currently I running a .2 ohm build. Running an 18650 at, say, 3.7 volts, the coils are dissipating about 68 watts (or about 18 amps), well beyond the capability of the DNA 30.
Sorry for babbling. Welcome!
Regards,
Rusty