Finally got the Rayon today, and rewicked. It does take more time, of course, than cotton - there's the extra steps of twisting, thinning, re-trimming after thinning. After reading about it shrinking/settling, etc. - I really twisted and put a lot in there. Actually deformed the last wrap of coil, and had to insert a knife to re-separate (spaced coil). Probably don't need to be that aggressive with how much rayon I use. I was kind of surprised at first- strong throat hit, very little vapor. Very similar to cotton break-in taste, though. After a dozen or so hits, it really settled in nicely. I think the throat hit is really still strong (maybe a chance to reduce nic if it keeps up), flavor good, no wick taste at all. Vapor production after break-in was normal. I'll see how it goes over the next day or so, with the different moods of my mouth & throat. But right now, I'm liking it. Not a massive difference from my usual cotton bacon, but different.
I still think with the higher combustion point and more efficient wicking, that it ought to last longer than cotton. With cotton, I do see buildup on the coils after a while, of course - but since I started considering rayon, I noticed that when I remove a cotton wick, it always looks a little charred under the coils. So maybe with better wicking and higher temp, it should taste better longer. We'll see.
Gotta go watch the Falcons beat the Saints now!