I am experiencing flooding on my cartomizers pre-punched I believe they are smoktek; lip on the bottom with three small holes. I fill it about 3/4 of the tank and it is good for about 10 mins or so.. Then flooding begins, sucking juices, spitty, and leaky. Most of my juices are 50/50 or 60/40 PG/VGs. Am I doing something wrong here? Thank you