I'll start with a 30ml or a 10ml. With the flavor I want to add, I'll add 1% or 2% to the mix. Then I'll remove 1% from the whole mix for testing on my rda (this works better from a 30ml when 0.3ml is the 1%). If it needs more flavor, I'll replace that 1% I removed with the flavor I want to increase. For instance, if I removed 0.3ml (1% of 30ml), then I will replace that 0.3 ml with 0.3ml of flavor. This will increase the percentage of that flavor by one. Of course, if you do this too many times, it will throw off the other percentages in the mix. Anyway, once the flavor starts to get better, I make a new batch that comes close to the levels I mixed in the previous batch. The process can continue. I'll even vape on something less than ideal to study what it needs. There is no need to use five bottles of juice figuring out a recipe unless those five bottles are productive.
