The 510 makes complete sense for a cigalike. It was the best of the bunch... but... We have devices in the 22mm range now... and when it comes to thread engagement for conductivity, bigger IS better.
I die a little every time somebody prefers 510 over Z2 or P3. People that own devices that feature P3 connectors, but purchase 510 Kabukis so they can use them on their whole collection miss out on getting to really see how great the P3 connection actually is.
I've been thinking about this post for a while now, and you are absolutely right. But having said that, it kills me that I have so many other great devices that I can't use my Kabuki on. So if / when an adaptor is available, that will solve this issue for me.
I've always hated the 510 connector, for too many reasons to list here. The P3 connector, and your proprietary connector from the looks of it, solve all of the problems associated with the 510.
You are in an enviable position, in my mind, being a successful and highly regarded designer and manufacturer of both atomizers and mods. Right now there are only two currently available P3 atomizers for the P3 connection, after a year of it being on the market, it's going to require a lot more choices in atomizers available in this threading for there to be any real, wide market appeal, and how is that going to be accomplished?
The Kabuki is great, but some folks really do require a larger capacity tank for their needs. Some folks may desire a more economy priced attie. I don't think anyone is going to rush to produce accessory items for a proprietary threading unless the manufacturer pushes for it. Especially since in it's stock configuration, it already supports the market standard, be that as it may...