I've been experimenting with my "Double Barrel" coils in the Kayfun. I have been trying to increase the resistance for use with my VW devices. I went from 20g to 18g to 1.3mm........
This one is........
30g - 12 wraps - 2mm - 1.2ohms - Rayon
I'm running at 20W and it still heats up very quickly, I can still get a satisfying pull in 2 seconds from cold.
Plenty of vapour and flavour, but it's cooler and a lot less harsh than my original 20g (diameter) 0.7 ohm build.
No noticeable difference in the air flow...........