Yes! Exactly! You probably can stop reading here; my rambling below just explains why this will work well for you. Those are also easy to work with, a good round number. And now I understand your complaint about the calculator! A single drop of flavoring per 5 ml, assuming 20 drops/ml, is 1%. You CAN'T make a 5ml recipe with ingredients under 1% with those droppers. You'd need to make a 10ml batch -- because 1 drop of flavoring in there (with 20 drops/ml) would be 0.5%. And you'd need to make a 20ml batch in order for a single drop of flavoring to be 0.25%. That's a lot to vape, if you don't like it! So to avoid the need to make a giant batch...do it just like you said you are. Mix the flavor concentrates, then add them to your base at the total % of flavoring in the recipe. You'll be vaping it just as it was designed, and you'll never have to make huge batches. Even better - if any recipe is just too weak or too strong for you, you don't have to remix all those flavorings from scratch. Does that answer all your questions? If I made it more confusing, don't be afraid to say so!