I started at 24, went as low as 3, back up to 12, now stabilized at 5.
Nonstandard, I know. I DIY and it is just the easiest recipe for me ATM.
20 drops nic, 20 drops flavor, 20 drops water and fill the rest of the 10ml bottle with VG.
20, 20, 20, fill, shake, drip, vape, rinse, repeat. ;)