Kayfun is old school, it's all about the Lemo's, sub tanks, and Atlantis tanks.
This is what I hate about "vaping". Why do you have to come along and rain on this guys parade. A Kayfun isn't old school, a Kayfun is a fabulous piece of kit...and nothing, including time, will change that. I've been vaping for almost two years, and I've tried most everything, and spent a lot of money doing so. In the end, I rock four KFL+'s, and one Erlkonigin. My KFL+'s are work horses, that provide a great vape, and keep me off cigarettes. Three of them are over a year old, and not a single item has been replaced on them...nothing, not even an o ring. That's not old school, that's quality. As a member of this community, we should support each other, not snub our noses because we have a different opinion about something.
OP, I've found a 1.5ish ohm coil, 2.5mm diameter, 28 gauge, 9 wraps, angled on the build deck, wicked with rayon, with the tails of the wick trimmed down by at least three quarters of what's inside the coil to be the sweet spot. If you need any help, feel free to PM me.