I would say just experiment with different settings and see what floats your boat. I assume that mod is regulated so you can't get into too much trouble, but someone correct me if I'm wrong. I'd start at around 7 or 8 ohms and adjust from there. In voltage mode, I'd start out at 3.0 to 3.5 volts and adjust.
Will that mod even fire a 1 ohm coil?