I think your Picos should handle DTL - at least to begin with. If you enjoy it, you'll probably notice battery life is a bit shorter.
The nautilus 2 and 2S can do a sort of restricted DL if you open the airflow right up. They have coils for it (0.4 and 0.7 ohm, IIRC). Maybe worth trying before you buy new tanks? I don't know how they compare with the Zenith - sorry.
The nautilus 2 and 2S can do a sort of restricted DL if you open the airflow right up. They have coils for it (0.4 and 0.7 ohm, IIRC). Maybe worth trying before you buy new tanks? I don't know how they compare with the Zenith - sorry.