oh, I didn't mean to sound condescending, and am super sorry if it seemed that way. I was just trying to help another DNA enthusiast. And to answer the last part of your question you can only set the wattage. In arctic fox for instance you can do +15% i hope this helps. btw im just a total nerd when it comes to vaping. It makes me giddy lol. I work at a local shop and am kinda forced to be able to answer tough questions but all my knowledge either comes from trial and error or plain curiosity. I even threw in some self made mod porn lol