i found this vid which seems to explain it far clearer so far. from Lordy ( though hes frequent ceiling glancing can be distracting )
so now i understand that both Nic and Flavourings come in a PG or VG solution rather than as standalone .
really the only real issue concern is the whole desceprency regarding drips per ML as several places ive looked have anything from 20-35.
and if im mixing up say a 5ml sample its going to be quite tough to get it accurate.
https://www.youtube.com/watch?v=fgjpc0rQWbc