I am looking to buy a Kanger IPOW v2 1600mAh. I believe it goes up to 15 watts (advertised). I have never used a VV or VW device. I have a bunch of coil heads some are 1.8 ohm and some are 2.2 ohm. Does the resistance level matter with a device that is strictly variable wattage? I assume the voltage will automatically increase or decrease with changing the wattage? I am just wondering it simply being able to adjust wattage will be better to vape from if the voltage will automatically zero out anyway, and if my coil heads make a difference? I am real to to the idea of variable voltage and watts... appreciate any info!!!