I love the supercharged effect of duals. I'm going to try a single parallel and a single twisted and see if I get what I want. I love a dense, warm and full vape. I haven't been able to get that on any single coil atty out there, even if the air is workable.I hear you on this. Duals are like twin carbs on a hemi.
I generally use 3mm ID with a twisted to try and maximize surface contact with the wick and allow it a larger reservoir within the coil. I have a fair few atties that necessitate single coils, so I've got dialling a twister down pretty much pat. The trick for me is getting the right air onto it.
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