1.0ohm coil on a fresh batt would be about 4.2A, an efest imr 18350 should handle 6A, if i'm not mistaken, please dont quote me on this do your own research, google is your friend. So you should be fine. I vaped ~1.0Ohm coils on my imr 18350s no problems, but below that I stepped up to a High Drain 18650 battery.
VapeSafe fuse is good for 6A, I'd recommend getting one. You could vape a .75Ohm coil on that setup.
FWIW:
Watts = Volts X Volts / Ohms
Amps = Volts / Ohms