I am not sure, but this is the first time I actually seeing/vaping a real wicking feed difference in the rayon vs the cotton..... I think rayon always wicks better than cotton, though not like "leaves it in the dust" kind of a deal, but I rewicked last night with rayon and its wicking like a champ....better than with KGD but I personally prefer the KGD over Rayon...........
Glad to hear about the IBTanked, I dont know if anyone else has my exact clone, so I got the middle of the road one (or the goldilocks)...not too cheap, not too expensive, right in the middle..... I guess I need to just order a IBTtanked glass....you just got the $5 clear glass one for the ErlK right?