Ive also been wondering that if spaced coil would decrease throat hit ans ive noticed a weird thing when vaping on the kayfun especially the 12 nic when i take some hits and then set my vape away for a couple of mins and start vaping again its quite smooth then it becomes a bit too harsh again
I've got a Kayfun Light but I think it's similar. First thing I would say is that you are using pretty high wattage for that tank. And I know what you mean about letting it sit for a few minutes. My experience is that you can't hit a Kayfun too fast, or take really long hits. It will get hot and progressively harsher for that reason. I try to space out hits on the Kayfun. I would try it with less power and maybe a slightly higher resistance. Don't know about spaced coils, I've always used them so I don't know if they are better than microcoils.
You can get a great vape out of a Kayfun but you have to live with the way it is. I use around 1.6 ohms at 9 watts.