I'm not a great fan of Clapton wire, the ramp up doesn't do it for me. Try with normal 26g first, a slightly bigger ID will allow for enough cotton, cotton bacon works just fine.Thanks, I know you like anything Billow! I get wicking perfect on normal dual coil setups and the Billow does flavour like no TF with a V16 engine can do. The wicking on this quad is tricky, but I'll mess around with it, may not get it perfect but definitely don't plan to use this build for daily vaping so doesn't really matter.
But now I'm curious about the 120w and about leaving the barrel off! I didn't know it works with the barrel off, I thought it would flood. If that's the case I have another tank because I've got one out of service because the barrel is missing. With the barrel on there's no way my builds would survive 120w, with it off and thicker wicking I'll have to give it a try. Claptons and thick wicking hmmmm, that could be Billow V2.2 for me...
I'm wondering about wicking your quad build, maybe try one piece of wick per coil instead of sharing a piece between the two coils, let one side hang over the juice channel and trim the top end off just above the coil as you would a vertical coil in an RDA. This eliminates the "bridge" between the two coils and should open up the airflow through the chimney. Try this with the barrel on and try with it off.