i have the AC9 and it's overtaken the DiD as my go-to genesis atty. i've been experimenting a lot with wick and coil set-ups both with the provari and mechanical mods (i have a GUS telescopic) and these are the basic guidelines i follow:
1) With a Provari: 400 or 500 mesh wick with 32AWG Kanthal wire. Since you can tweak your voltage, i would recommend a coil wrap that amounts to 2.0-2.4 ohms. i currently have a 4-3 wrap on #500 mesh clocking in at 2.2 ohms, rocking it at 4.8 volts. My mesh is thick-walled by the way (little to no center hole) and is fitting somewhat loosely on the wick hole of the AC9.
2) With mechanical mods: a low resistance coil is the way to go since your voltage output on 18350, 18490, and 18650 batteries (granted that you are using these) is basically 3.7 volts. for me i prefer to be in the 1.1-1.4 ohm area for mechanical mods. i've used 28awg kanthal on the same AC9 wick that i have and it yielded me 1.2 ohms on a 6-5 wrap (i didn't keep track of the numbers of wraps so 6-5 is a rough estimate). You can attain a low resistance coil using 32AWG but you would have to have less wraps around the wick (like 2-3 or 1-2?). of course if you have a mod that can accept a kick, you can stick to a 2.0-2.4 ohm coil as well.
again, these are just basic guidelines i've been following from my own research in RBAs, coil & mesh setups, etc. good luck! you'll enjoy your AC9 i'm sure!


