I've had my nautilus Mini and istick for about 2 months now, and have gone through a few atomizer replacements, only to notice that none of them have had as high of a wattage as the one that originally came packaged with the tank (that one went up to 15.9 watts, and the one I am using currently only vapes at 14.4.) Is there any way I could fix this? Do I need to clean a connector or something? Any help would be appreciated!