VaporNine Turbo cartos are great, as are V4L CoolCarts and NHaler's Mega Cartos. All these are 3.2 to 3.4 ohm cartos and great for 5-6v
vaping. Presently I am enjoying some COV 302D 2.0 ohm cartos in my AFS2 at 3.7v and getting tons of vapor. For the moment at least, the COV 302D cartos are my fav for the AFS2. lol
Cartos are the way to go for the AFS2. No flooding, leaking or running dry, and the only time you need to touch the Control Ring is to close it while you are filling the tank. You may have a little flooding when refilling a tank previously filled with the same carto, but it usually clears up after several vapes, or you can soak up the extra juice with a q-tip.
About two tanks is all I get for a single carto which is equivalent to about 10 carto refills. After two tanks all of them will have a reduction in vapor and start to experience flooding. If you can afford it, or just want to indulge yourself, put a new carto in with each new tank and you will be in VAPOR HEAVEN!