OK...another Franken-Wick concept. I seem to be going in the opposite direction than some, but here's what I'm playing with right now.
The 5mm wick has been working fine in the RSST, but I didn't like two things. One; trying to get the Ohms down to below 2.0 Ohms and still having enough wraps on the coil to produce decent vapor, and Two; the Vape-lag with the large diameter wick....it was like: hit the button...wait...wait..wait...OK, finally a nice vape.
So... I made a new 5mm wick & turned the top section down to 1/8 inch (opposite from what others have done - my "reservoir" is in the juice):
Did a 4/5 wrap of .5 X .1 mm Ribbon Kanthal that's giving me 1.9 Ohms. Nice wick coverage, I may remove a wrap later to bring the Ohm rating more inline with my sweet-spot (< 1.5 Ohms), but for now, just going to break it in.
The vape-lag has been reduced significantly....just a slight delay between button press & vapor production, but still takes a second or so before its optimum...I think it will get better as it breaks in.
Wicking is already starting to pick up after about half-a-tank, the top of the wick is staying wet even after a couple of long pulls and flavors are starting to come out.
So far, so good....I'm already starting to like it better than the straight 5mm wick, but I'll have to give it a day or so to see if the flavors are as good as the larger wick.
Definitely seems to be some trade-offs between the various ceramic wick diameters...bigger may not be better (for me at least)....only time will tell.