Something I was just thinking about, how is the wicking on the kayfun lite with thick liquids? I've been having wicking issues with a new liquid I'm trying in my aspire which usually handles thick liquids well.
that's the same thing i ran into with the aspire stuff. i had a couple of boxes of heads that were fine with thicker juices and then a run that weren't okay with them at all.after looking in to it, their website "suggests" 50/50 at the maximum for their coil heads.
70vg in the kayfuns is about the cutoff in my experience. i've drilled the airflow out on mine and that exacerbates the problem a bit by lessening the vacuum.i have experimented by widening the feed channels where they enter the chimney and that has helped some but,i think a lot of people just do the primer puff thing,tweak their wicking and go on about their lives.primer puffs can make them flood pretty bad if the wicking is off even a bit and just seems like a band aid fix for issues with the channels and chamber air pressure.
i've settled on a little more wick with the coils a bit bigger and further off the deck with the wick tails right over the channels and can pretty much chain vape off my kayfuns without dry hits or flooding at 70/30.anything thicker than that goes in the drippers.