I have done the lamp burn test using 100% pure vg as the fuel to prove my point. Using a tight 500 80mm 2.5mm dia tight wick and a 500 60mm loose 2.5mm. The tight had a larger flame and burned off the 3ml of 100%vg faster. I am no longer using kerosine, vg as the fuel is a better test for our use. Viscosity reduces capillary action because cohesion gets stronger than adhesion. Capillary action is a molecular action and to reduce it in any viscosity you have to approach the molecular size of that liquid, that would be a very tight roll, until you get to that point smaller wire and hole tightly rolled is better for capillary action and the lamp tests prove it no matter what fuel or viscosity. True as you say less liquid under the spiral but that liquid still has to move in the wick out to the spiral coil and be replaced and faster is better. I won't get into heat sink effect as I really don't see it in my higher voltage preference. This is not argumentative, it is just a simple scientific test and there are many other factors in our vaping. My only purpose in these tests was to show the true effects of capillary action and prove some myths wrong. A looser wick may be better for some as more thermal rising would be present or more gravitational flow thru tipping. I was looking for a true vertical wick that could keep up with my vaping and thankfully I have found it.It is true if you use kerosene, but with much more viscous liquids like PG or VG this law depends on viscosity. Also, independent of liquid nature, if the mesh has the same wires, but they are closer to each other, less liquid under spiral. You get more metal (more heatsink) and less liquid. I already wrote about viscosity, no need to repeat
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