I apologize if I was sounding critical; that was not my intention.Sorry I only use the drop method and not %'s, I just started doing it that way, way back when about everyone used drops and never changed. I suggest try 10 ml by drops and see if you like it, if yes then convert to the way you like by % or by weight for bigger volumesI keep my juice making so simple and just mix in the bottle too. I add my drops, then half the Nic PG/VG mix I use and shake well then add rest of base and mix again. Pretty easy! LOL
Unfortunately, communicating in "drops" is like communicating in "scoops." It is like me trying to give you a casserole recipe; telling you to add 6 scoops of shredded chicken, 4 scoops of diced tomatoes, a half scoop of finely chopped onion, and a sixteenth of a scoop of fresh chopped garlic. Put it all in a 9 x 9 baking dish and fill with macaroni and broth. Without an agreed upon understanding of what a "scoop' is your ability to make a casserole that tastes like my casserole in pretty slim.
Perhaps I could equate your "drops" to "parts." 5 drops X = .05mL X, and 3 drops Y = .03mL Y; combine all flavors into a flavor base and then mix that flavor base together with an unflavored PG/VG/nic base. That will mess with my PG/VG ratio and my nic strength. But, at least it will let me taste your overall flavor profile, as you intended (assuming all your different flavors have the same-sized drops and my equivalencies are correct). I will still need to play with the "flavored" to "unflavored" ratio but I should have a basic understanding of what you want me to taste.
And now I see I must apologize once again. You created this thread to share recipes and not discuss technique. Please forgive me; I did not wish to hijack your thread. Your recipes do sound yummy! I just get a bit (OK a lot) OCD about my making what you are making.
I have started to shift from measuring by volume to measuring by weight just for the visual benefit. I'm only 54 but reading those fine marking on a syringe is rough. Beyond the convenience of the digital readout I am still out till further notice. Most of my flavors are in glass (I won't put them in plastic, or dropper-topped bottles because of accelerated loss of desired volatiles... some flavors I won't touch but once every six months if that). And I am too cheap to toss a pipette or syringe for every flavor every time; so clean-up seems to remain about the same. Weighing just works for me.