I'm using an IPV2 regulated mod, so I don't sub ohm at all on the Magma. Dual coil 30 gauge, 11 wraps each on a 5/64th in bit, 1.25 ohms. Good bit of surface area on those coils, and they heat up quick.
Rayon wick thick enough to provide some resistance when pulling through the coils, trimmed so they almost touch the bottom of the wells. I was using cotton, but rayon performs a LOT better than the cotton - almost never get dry hits unless it goes almost bone dry. Also, a dry hit on cotton is 10x more unpleasant than on rayon.
Usually have my mod set to 25-30 watts, depending on the juice, with the AFC ring removed. Great for lung hits, and the flavor kicks me in the face. Throws pretty good vapor, too.