You're focusing too much on the resistance of the coil. Assuming that you have a regulated device, watts are what you should be looking at. Lower watts means that you can use higher mg eliquid. Sure, lower resistance coils are usually made with thicker wire and require higher watt settings, but that's not always the case.
As for Kayfuns, the KFL is a bottom fill tank, where you need to take the tank of the mod and use a screwdriver to remove the fill screw. It's a drag, and I'd recommend something like the Kayfun Mini v3 or the Kayfun v5 instead. Those are modern tanks that are filled from the top, and in contrast to the KFL you can access the coil without emptying the tank.
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I wouldnt.
I have a Kayfun Mini V3.
Mini V3 is top filled a s if tge O rings are weak as they were in mine; Juice leaks out tge airflow unless i turn off the Juice flow before meals and before bed time.
The lite plus is much easier to build than tge Mini V3. That stupid wall around the build deck ruined the Mini V3 for me.
The lite plus standard with Steel , glass, or M Tank holds 4.5-5 mls Juice. Mini V3 only holds 2 mls.
One ECF member bought a 5 mm tube at a hobby shop to extend the Kayfun snd put a bell cap on top of an M Tank. He said the Kayfun held 9 mls.
Every single part of the Kayfun lite plus is available even the insulators and 510 pins
A few parts of the Mini V3 is available but not the entire set yet. They may come but not yet.
A Kayfun with spare O Rings, screws, bases, barrels, etc yoy can keep a Kayfun going practically FOREVER.
In all honesty i woukd not trade MU Kayfun lite plus clone for 12 Kayfun Mini V3 attys