I buy my Wife boge SS 3.2ohm cartos, every month from Madvapes. I fill them at 25 drops. It takes a little patience, or just flick the carto downwards, to speed up the saturation process. Wait 20 to 30 minutes, before vaping. Then take very small hits until you hear it start wicking. We've had no problems for the 2 years we have been vaping. I hope this helps..