Tom, I wonder if the wattage ratings for the 0.5 ohm coil is based on the coils for the Atlantis 1? The newer style coils do have larger wicking holes (they look to be about double the size) so the 0.3 and the 1.0 ohm coils should be in this newer style. Although the 0.5 ohm coil that comes as a backup coil in the Atlantis 2 also has the larger wicking holes.
Yeah, I think the wattage rating for the new .5 ohm coil is definitely based on the old style coils. They use the same type of wire, I'm pretty sure it's 2" of 26g kanthal fused with non-resistant wire for the top and bottom sections of the coil.
When I got my Atlantis 2, like 2 & 1/2 weeks ago, I swapped out the .3 ohm coil for the .5 ohm coil because I didn't want to run it on my sigelei 100w and go through juice twice as quickly.
Not only do the coils have larger wicking holes, but the coil itself is a larger diameter. And the new .5 ohm coils definitely hold up much better at 30w than the old. The one I have had lasted longer than any of my old style .5's.
Not to mention that the old style coil read at .6 ohms on my sigelei 50w's display and the new coils read at .5 ohms on the same box