what's the resistance of your coils? the air hole in a stock octopus isn't nearly big enough for a sub-ohm coil. unless you drill it out, you probably should be using something like a single, 1.7-2 ohm coil on it.
not sure what the octane is, but for a trident clone (assuming the airholes are the same as a real trident), you probably want to be around a .6-.7 ohm dual coil (that's 2x 1.2-1.4 ohm coils) if you're not going to drill it out.