The Origen dripper fits all of your criteria: 22mm, dual coil capable & adjustable airflow. It has two deep juice wells that you lay the wick into, and it holds a good amount of juice. I can easily get 30+ hits out of it before having to add more juice. It's meant to be set up with a vertical wick/coil, but I set mine up with a horizontal coil/wick. I would definitely recommend the Origen over the Omega; I wasn't too impressed with the Omega.
I just got my Origen dripper last week. I have a dual vertical microcoil setup with cotton @ about 0.45 ohms. I'm using 28awg kanthal round wire, 5 wraps around a drill bit. I think the drill bit is 1/16 or 3/32.
It hits okay, not as hard as an Omega that I've tried. I'm wondering if it's because the airhole is only 2mm. Or maybe it's my setup.
Could you post a picture of your horizontal coil setup and some info that could help me?
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