i have been blending stock juice to adjust the levels to my needs. i like to end up with NIC 14 and 35% pg. given the inconsistency issues with most juice vendors, i have been thinking about making from scratch. but it is a little intimidating. i can do the math but don't understand some basics. for example, one flavor supplier says to mix their flavoring to 15-40%. is that the amount of flavoring as a percent of total volume? should i start with 100 mg and cut to end up with 14 mg? appreciate any help