I'm guessing you have v4.3? (Large deck, says fogger® on the chimney, fogger4.0 on the metal part over the glass tank)
Can't say with the filling, I've had a 'lil come out of the drip tip sometimes... But I think that has to do with me putting too much juice on the wicks when I prime them.
As far as the airflow goes... The Fogger v4 has the best airflow of any tank I've used to date. Wide-open airflow means a lot to me as an ex-hookah smoker (used to taking lung hits, never smoked cigs so don't really know how to mouth-to-lung) and this thing definitely delivers there. If you're getting a tight draw with the AFC ring completely off, then there's something blocking the airflow. Take a small flashlight and look into those channels for any obstructions, if there are any either try to clear them out with a paperclip or re-drill (same diameter, unless you want even larger air holes for some reason) them.
Also as mentioned... If you have the big fogger (meant for 26650 mods) there are a lot of problems with it quality wise so that'd explain your problems right there.