pull the trigger , its the nic but iv tried un flavored and wasn't happy so its both

Recovering smoker? Are you dual using some? I ask because it just seems a low nic for someone possibly still recoveringI`m still a recovering smoker rather than a professional vaper, so habit only for me...."group 3" as mentioned by @dbrandt01
Low nic - 1-3mg
I`m not that bothered about accuracy when mixing half a litre, could probably cut it down to zero but less is more when chain vaping to prevent nic nausea.
Low flavour - 3% dry/mild tobacco just to take the edge off the carrier [non]flavour
Less is more yet again - I don`t want to be able to taste any flavour after not vaping for several minutes.