I tried this a few times too, worked best with 2mm silica and non conductive wire legs. Dual coil, 4 wicks. Got me 1.8 ohm.
But honestly.. it just wasnt worth the hassle, without adjustable airflow... {moderated}
(added after moderation)
all disrespect totally intended towards the tank, not the indivdual, I consider the i30 just a lousy sub-par tank. I worked on it myself thinking I could get it better, but it still never performed as well as stock coiled aerotanks or nautilus.