I don't completely understand power control... I currently have two rigs, an aspire Atlantis on a CF sub ohm battery and a Kanger sub tank on a smok xpro m45. Obviously the aspire products works best teamed up but the kanger says 15 to 30 watts. I have some electrical background and i know that some situations call for precision power control while others are more lax. From learning with an old vision spinner i know not to over power a coil. But is it possible to under power? Even though the kanger calls for 15-30 watts, I'm comfortable with the vape i get from 6 watts. Can i damage my coil?