Please forgive my photos, I don't have a decent macro lens.

This is a quad micro coil with 28 gauge on a helios. It comes in at .28 ohms. This produces good vapor without too much heat, and the wicking has an easier time keeping up.

This is a quad parasplit with 28 gauge that dex posted on his facebook page. Its on the atomic RDA and was .45 ohms. It didn't work well on the atomic. The problem was that the chamber of the atomic is so small I would get a "misting" of e juice. I think this build would have been pretty great on one of my larger RDAs.

This is the best setup I've tried to date. 22 gauge macro coil on atomic RDA comes in at .17. The vape is a bit hot, but the flavor and vapor production are off-the-hook. I was really surprised with how well the cotton wicking keeps up in this build. I was sure to leave a gap under the coils for airflow (not blocked with cotton) and it makes a big difference.

This is a 28 gauge quad revolver coil, another one I saw on Dex's FB page. This is on an IGO-W and comes in at .48 ohms. I'm still playing with this one, haven't even wicked it yet. I don't expect it will beat the 22 gauge macro, though.