I have a Magma that I use for dripping, used on a Provari. I have usually done only single coil setups, and have been having great success. Tonight I built a dual coil. 28g, 12 wraps each, 1.3o. Anything higher than about 4.3v and I'm hitting the amp limit. At 4.3v it seems to take forever for the coils to heat up. I have to count to 3 after firing before taking a hit, and I seem to get better vapor production out of the single coil setup. Maybe I need to use higher resistance wire, fewer wraps to heat up quicker? Or maybe this setup is just better on an unregulated device?