Most sub ohm tanks have adjustable airflow and can be dialed down. I've got a subtank mini on mine with a 1.5 ohm coil on the rba deck. I tightened the airflow and am running at 12 watts. I haven't tried one but the isub tank is pretty inexpensive but doesn't have an rba deck. I won a triton tank the other day and am excited to try it when it gets here.

I've seen the innovation mentioned several times in several places, but not explained. Can you 'splain please?
Here ya go
