I don’t really see why you would change any gravities for VG, PG and your nic though. Their gravities are pretty stable if you have a pure product. There may be very little variations but too insignificant to change the default values of
- PG: 1.036 g/ml
- VG: 1.261 g/ml
If you’re going to start playing with these variables (?), others are going to start to have difficulties reproducing your recipes should you ever share them. If you create a recipe and work with the default values, you’re always going to be able to reproduce it, even if the weight is not 100% accurate and that’s what recipes are all about, the ability to reproduce your results.