So,
@mikepetro was good enough to send me some Rayon to check out. I stuck it into an RTA which I keep for NETs, which gunk up coils/wicks fast in my experience. I had been using KGD in the tank.
What an amazing difference. I think the flavor is better, though not overwhelming so. BUT, I can go at least twice as long, and probably three times as long before I need to clean it out. And, maybe my imagination but, with the KGD the flavor began turning from good to ashtray gradually. In other words, I lost the great flavor half way through. With the Rayon, it stayed consistently good until the end, when it suddenly fell into the ashtray. Impressed.