I am using the Demon Killer coils Hive coil .5Ω which is the reading I get on my tab and on my mod! I believe the ID is 3mm diameter. I use cotton bacon and I make sure it is snug, fluff out the ends and split them and this time I put the tails into the wells! So far so good, not flooding and no spitback! I am now using on my SBody Legend DNA at 25w and I like the vape and the flavor! I am new at all of this and know I have been making some errors, but I am trying! I sure like the single coil much better than the dual!