Ah, the NGP is a great device. I have a silver anodized Touch version and just breaking in a setup I would like to share with you:
I am using a 500 mesh with 37 x 75 mm (37 is the length into the tank with a bit of reservoir above the coil, 75mm is needed for a solid wick), once heated before rolling and oxidized under the coil only. I use AWG 29 Kanthal A - 6 coils, measuring 1.3 ohms. Batteries are 18350 AW IMR and Sony US18650V
This setup is able to wick Bobas Bounty vertically and I love it. Which is wierd because I never liked Genisis style atties, I even sold a Cobra because I couldn't get it to wick properly.
The only issue I have with the setup is a delay of about half a second between firing and good vapor production - but I can deal with that.
So, if you have wicking problems, try to get hold of 500 mesh and AWG 28 or 29 Kanthal (0.30 or 0.35mm) and use a lot of it.