I did the burn test, and the stuff from the pill box is indeed rayon. In the face of such overwhelming evidence from you guys, I will have to reconsider my opinion. I will try using less material and see what happens.
Sounds like however you wicked it was too tight.
Too tight = muted / too loose = coil dry burn at higher wattage.
Rayon responds instantly to any change in the wick parameters.
Very few get the density right on the first try but it should take no more than four to six tries to nail down the density
With each wick you make always be sure to inspect the WICk for fitment in the Coil don't be afraid to push down on the tails to see if it exposes the gap in the edge of the Coil, after about a tank, when the rayon has settled it should look somewhat reduced in size with slight shoulders, but you want to have shoulders because if you don't have shoulders up to the top of the Coils, then it's going to be too loose and you're going to get a gap at the top and it's going to want to overheat
When You first put the WIC in the tales coming out will look a huge as well as the shoulders but after you get it wet start using it get some juice and some heat put through it all the air gets purged out and all the strands will start to come together more...
This will be near the final look of your WIC - this is the part where you really want to inspect it. Also always inspect fitment before you remove any wick especially if you have a problem so you can see what's going on.
And on the tails......
In most cases, depending on rba, you will want to remove a very large portion of the fluffy tail. A tail too big will hinder the performance of rayon dramatically. It's not a sponge you don't need a lot in the wells. Even Just 5 strands of rayon going down to a dripper deck have enough transport power to feed my single coils at 40+w and dry the well too.