Cocoa is 1 drop up to 50ml then 2 drops over, but there's no need for more than that as it's way to strong. Sweetener is 1 drop per 10 ml same with the Vanilla
This is my EDV - I've been playing with the PG/VG mix trying to get less PG and still keep the flavor. I used Smirnoff Vanilla to dilute the VG down a bit and man did that make it nice. Hope you enjoy.