Hi I have a couple questions First I just changed my head and now when I use it I notice a little vapor in the tank never seen that before. Second What is the lowest ohms head I can put on using an evo battery. Third The one I took out was a week old I rinsed it under hot water it cleaned pretty good except for a little burn stain where the wick was sitting on the atty. Should I replace that or just slide it over. Also is it like the regular atty's after they dry I used to do a dry burn to clean the coils. Would you still do this and would your remove the wick before dry burn? Thanks