Pg gives a kick, vg smooths the vape and then it depends on the setup. I’m at almost all vg as I like a smooth vape and I’m on a Dead Rabbit but at the same time it’s too thick on my Ammit which struggles with the thickness of the liquid.
I would just go with what you like as there’s no real correct answer to what’s best with mixture.
Are you still trying tobacco flavored liquids? If so take a look at manabush they do a lot of tobacco based liquids and they're quite popular with folks that like that tobacco flavour.