I have read about flavor percentages for DIY, but they have been percentages for a one flavor only e-juice. For example, 10% of X flavoring mixed with base of PG/VG/Nic. What I was wondering if there was a way to know (without wasting valuable supplies) how to mix several flavors together. For example 2% of X flavor goes with 5% of another in a mix when they are much higher as a standalone flavor.