80Vg will struggle in quite a lot of tanks as this ratio is best used in drippers.
if you are using any coil with a high number like 1.8, 1.6, 1.5, 1.2 then these are best at much lower wattage and as i said above it should be written on the side of the coil. saying that not all of them have this info so if we knew the tank and coil you was using we could advise straight away.
if the coil number is low number like 0.2, 0.25, 0.5 then these are for much higher wattage and depending on make it can vary from 30watts upto 100watts.
tbh i would stear clear of smok as they have flooded the market and their QC has dropped a lot.
have a look on post 5 of this list for our hardware suppliers and see if there is anything apart from smok you like the look of
POTV Vendors & Recommended E Liquid Suppliers