You only need to adjust one. They're all relative to eachother. Turn up voltage, and the wattage is produced by the voltage and resistance. Turn up the wattage, and the voltage is adjusted by the processor based on resistance. Just to clear that up..I don't know if you're adjusting one and trying it, then trying the other, still. A 1 ohm atomizer is 9 watts at 3 Volts.