Playing around with my 30w box, I made a 2mm ID micro coil, 30g wire, about 14 wraps! 2.5 Ohms (haven't got that high in years), in the Achilles.
At 14 to 15w its pushing 5.6 to 6v (depending on the setting) and with a cotton wick its a thicker, warm but cooler on the throat vape than my sub...