i run one on a mech at .9 ohms and one a provari at 1.8 ohms.
I have found in my own tinkering, its not so much the wraps but the amount of wicking material. everytime i tried a single wick the results were horrible, now on both of mine I run doubled 3mm, the .9 is 29g ribbon. the 1.8 is 32g round. i make sure the ends/loops are not longer then the base or shelf and I think this is the most important part.
then after putting on the chimney tube. i take a small screwdriver and make sure all the wick end is down in the sides I have had no problems with blocked channels or flooding either. on the mech from fresh battery to 3.4 ish volts i get wicked clouds.