Leaking of an atty isn't caused by the P3 or any other pv for that matter, all the pv does is provide power through the threaded connector.
With the Kayfun it's usually seal, vacuum, or wicking related. If it's just a few drops and everything is fit and sealed properly it's probably just pulling a we bit to much juice into the chamber. You can try loosing the airflow adjustment just a little if it's not already wide open and that should help.