Did you use the kiln treated stuff? I haven't tried it in a tank and doubt I ever will(genny). I've used it as a wire rope topper and that was good, but soft wicks aren't too good in a genny as the standalone wick. It actually wicks really well as a short vertical piece in the dripper(assuming you didn't wrap the coil directly on the ceramic and choke the hollow center. At the very least you need to stick something through the center when wrapping, but like I said, 1/8 mini coil with the 116 twisted through afterwards is perfect. After you twist through you stick something through the center to expand it more into the coils and leave the center hollow. When I first did this I was surprised how many puffs I was getting for the kind of clouds I was blowing since I was all about the cotton before experimenting with this. That XC setup will easily last a month. Heres a couple old firing pics of the setupI agree with your disagreement. Cotton won't burn, no matter what the ohms are, as long as you have your densities down and it is supplying adequate juice. works great, hemp fiber works better, but cotton works great.
Yeah, tried the XC-116, didn't like it, wouldn't wick enough, to many dry hits, was a waste of money. Might be fine in a dripper, cause once saturated I vapes fine, but in a tank rba system, it sucked, couldn't keep up with hemp or cotton. Being stubborn I keep trying every now and then, but no. Is kewl that you can flame clean it, liked that. lol
I use hemp fiber in all my builds. Only use the cotton when testing out a new build, and if it works to my expectations, then I replace it with cotton when it needs to be re-wicked.

I agree with you on the hemp vs cotton thing but instead of using cotton from the start I just go right to hemp. I have the kilo from hemp traders so I'm not too bent out of shape if I waste a piece. In fact I give it out all the time locally. If I see someone using cotton in an RBA, I reach in my backpack, pull out a tuft of hemp, give it to them to try. hemp made cotton a second class wick.