I've not had very good luck with the 400 mesh with my thicker juice, but I've always done a tigher roll than what you are using. Maybe I'll try it at 14mm. I've been using 325 mesh at 20mm rolled down to 2mm. Plenty of throat hit, TONS of vapor and it never runs dry because I leave a good 1/2 - 3/4 in of meshroll above the coil and the coil is sitting less than 2mm from the cap the mesh is inserted into.
I've always found that running resistance down to under 2.0Ω lead to burning quickly even with the air hole right on the coil so I would have to do 1 second pulses to retain the flavor of the juice. Could be the batteries too. I'm running AW 18650 2900mah so they have alot of power and running to that small a load I end up with more watts than I can efficiently cool with the airflow I like...unless I'm in air conditioning, lol.
Now I'll have to go measure one of my spare wicks... 14 or 20? I was rolling and oxidising them 10 at a time since I was swapping them out almost twice a week. Then this one just sort of settled in and it's been a month now. I'll go unroll one of my spares and make sure.
I'm running the same battery almost (AW 18650 2600mah). I also use my BB which takes a AW 14500 750mah. You can tell the difference between the two. Down under 1.5Ω I do end up pulsing on occassion and it's fine until it gets somewhere over 2Ω where there just isn't enough hit for me.
Before this last wick and coil I would wrap to something around 1.5 or less with 4 wraps. After about 3 or 4 ml through it it would get gunked up and weak. I would remove 1 wrap (during which the caked on gunk would get dislodged) and was good to go for another 3 ml. Then I would replace wick and coil. This was pretty consistent...until this last one. No idea what happened but it's just been steady for over a month now (1.5 ml a day). A bit of gunk just above the coil but you can still see all the coil wraps. They're all black looking but no significant build up over them. I may have entered the twilight zone
just measured everything.
I mispoke. my mesh is 20 mm rolled to just about 2 mm or just under (no, I unrolled one of my spares I carry with me and not my magic never-ending wick that's in service now).
My coil is 1.3Ω measured at the 510 connector.
oh, my wicks are 40 mm long. 30 mm tall tank, then the top cap. After that about 3 mm of bare wick, 3 mm with the 3 wraps around it and maybe 1 mm sticking up above the top wrap.