Have you tried blowing through the drip tip with the airflow loosely covered by a paper towel while the device is not on a mod? Sometimes it just clears the excess juice.Ì have had the problems right out of the box on both. I started at 15 but have gone up and down to see if I could figure out the problem. Played around with air flow too. Nothing. The only thing I noticed is it is a lot worse when the coil is first used. After a few hits it gets better but still bad.
Also with the zenith if you leave the fill port open too long it will flood a little and needs to be cleared by blowing through the tank.