Update. Tried cotton bacon. 2x wicks over 2 days on the Kayfun v4. CB has a weird metal-like taste. 2 wicks later I got sick of the taste and went back to koh gen do. New KGB wick and after around 10 pulls normal service was resumed. It's not my coil and I washed the Kayfun inside out and it still had the same taste. CB wicks like nothing I have see. The thing is awesome for chain vaping but the taste is always there. I bought 2 bags so I will open the other one and try it on the marquis rda and see if it's any better. So basically CB....great wick material but cranky taste. 2nd bag to test. Must admit. KGD is so freekin consistent. If only I did not get dry hits as often as I do. For comparison KGD at 17w and 20w was damn great. KGD is 15w only for me. I am thinking that maybe I should try 3mm or better diameter coils and see how KGD holds up against my current 2mm coils