Just fyi, the istick mini has a safety cutoff officially at 1.0 ohms. I've personally had 0.8 ohm coils fire on the device, but nothing lower worked (a "Lo" error message pops up). Kanger makes 0.8 ohm coils for the Aerotank, but I don't think you'd get consistent operating performance out of them. IF you decide to go lower in resistance, keep it at or above 1.0 ohms, just to be safe.