I think the iclear 30's use dual coils, and I'm guessing they're either 1.8ohm heads or 2.2ohm, which is kind of high resistance for a mech mod. A mech gives you whatever voltage the battery has, usually starts at 4.2v then drops off as you use it. While you can use mechs with higher resistance coils, it's not where they shine. If you're going to use clearo's, you may want to pick up a regulated device with variable voltage/wattage. If you want to stick with the mech, you may want to look into rebuildables, and BETTER BATTERIES.