I recently got a kayfun 3.1 for 15$ from the guy at a vape shop i know, so i figured what the heck thats cheap ill test it out. Currently i have a 1.1 ohm build and its an ok vape, Air hole is a bit tighter than i prefer when its fully open. Has anyone ever tried to build it lower? Any advise on the tube piece that goes over the deck, has anyone ever had it just unthread while in use? The 1.1 build is just a micro coil about 5-6 wraps of 28g with japanese organic cotton. The flavor is quiet nice currently but wanna try to get a bigger hit, might get the machinest at work to make the hole a bit bigger to increase airflow if it can wick good in a sub ohm build.