It sounds like the cotton it too tight. I would use less cotton. Just enough to touch the coils. More juice with less cotton. Should be a better vape too.
I think a single coil is better for me. I get just as much vape and if it uses less battery, it seems a no brainer for me. Thanks for the help though :-)
I just found a definitive answer to the power used on dual coils I think. It would seem you are actually using 4 times the power for a dual coil. My dual coil for example came in at 1.8ohms which means I have 2 coils that are 3.2ohms. That means I'm actually powering 2x3.2ohm coils. Does this sound right? If so, it doesn;t seem worth running dual coils.