I use Origen Little 16 clones on my Reo Grands. I build them with a 5-wrap single coil between the posts using 28-ga kanthal, 5 or 6 wraps at 2.5-mm. Not sure what the resistance is, but I'm guessing around an ohm, give or take.
I used the Little 16 with the dual airflow set to the largest openings and get a restricted direct lung hit.
Battery life is pretty darn good with the smaller gauge wire, and vapor production is satisfying - not huge clouds, but good enough for me. If you want more vapor and warmth you could try the same coil with 26-ga kanthal, which would lower the resistance and give you more wire mass, but shorter battery life.