I tried the 0.3 coils and unless the coils don't fit properly in your tank, these aren't the problem. They are designed to consume a small amount of liquid, and the liquid won't come easily true the holes of the coils so if the coil would be the problem the holes of the coils should be pierced or something similar.
I've noticed this when I had some dry hits and burn tastes on my tank a week ago and when I searched for an answer they said I needed to pierce 2 of the holes with something sharp like a nail. After this I had no more problems with it and the dry hits were gone. With that being said I'm sure the coils aren't a problem unless, of course, if the coil doesn't fit the tank.
Hope this helps!