Jeremy,
Sub-Ohm coils have to be built; you cannot buy them. For what you're running (the Aspire Nautilus and iClear 30s) you actually
want coils that fall above 1.8(ish) ohms. These tanks use small coils that are comprised of higher-resistance (smaller) wire which works better in those kinds of clearomizers.
Sub-Ohm coils are best utilized in something like a Dripping Atomizer, where you have much wider airflow capabilities and a larger deck to build on.....You also need to make sure you're running the correct battery. Sub-Ohm vaping is best done on a "mechanical" mod, which does away with all the circuitry (like on your VTR). With a mech mod, you have just a battery that's pumping electricity directly to the coil(s), no circuitry involved. You VTR will sub-ohm, but I think it has something like a 5 amp limit.....
Here is a pic of my Atomic Rebuildable Dripping Atomizer running .4-.5 Ohm Dual Coils....
