One other thing.. Rayon tends to work excellent with more wicking outside the coil in the chamber or deck.
Reason being-
With cotton if you have a lot outside the coil. The cotton will soak it up but hold it at the opposite end. It's widely recognized the the cotton will dry at the coil while remaining wet at the ends or outsides. Cotton holds better than it transports the liquid.
With rayon, it transports so efficiently that if you have a 1/16 coil with 1/16 short wick it may transport so fast that the tiny wick will give up
juice faster than its little pipe size can flow. So a larger diameter may help or just more wick in the chamber or on deck. Because it will completely wick to coil from the ends with no delay. So more is more reserve, a holding tank if you will to feed the high transfer to coil. When the coil flashes the rayon just dumps any juice in the wick instantly into the coil.
This has been my experience with the oddy build. It shines with it external wick because there's more juice around the coil. Standard kanger with overwick seems fine since there's overwick.
This may be different for different rbas but keep it in mind...