Haha just saw this, just wicked my RSST today with a cotton U wick, working great, used a Kanthal ribbon coil, I love cotton in my protank and it makes my vivi barible so I figured what the hay. So far so good, great juice supply. I just rolled a wick from face pad cotton.
P.S. I know some say they have had issues with the cotton wicks crapping out after a few hours, since I switched to kanthal ribbon I have no such issues.