Kayfun airflow is too tight and e-liquid flow is too slow, it can't really handle sub ohm properly.
Not saying you can't but you should not.
The plastic will not hold up well for sub ohm let alone the build deck is not really able to handle the size of a 22 ga coil to get it to .5.
24-26 and you are pushing the captive area of the screws. but at the heat level I would be more worried of vaping and inhaling melted plastic and causing a dead short.I thought the same thing lol, thats mighty thick wire for a Kayfun deck .