morning...vg is def best for vapour, as for the mix....can put what you like in...if you have 54mg nic and vape at 18mg then dilute with just vg then your base mix will be 66.6/33.3 VG/PG ratio...your mix will be quite thick though but not un-vapeable.could dilute your vg with distilled water or vodka first.
i have pg and vg and vape at 18mg so i use exact amount of each,so 10ml of pg nic,10ml of pg dilute and 10ml of vg dilute so my ratio is 66.6/33.3 PG/VG ratio...this is my base mix so once my flavouring is added im usually vaping at 14-16mg but thats fine for us