as everyone posted here it is really simple to make a mix. but after that i like to tweak my recipes by feel, not numbers;
phase one, mix and try in a dripper.
phase 2 if I like think I can commit to this recipe it goes into my evod.
phase 3 sometimes I like to tweak by feel as I do cooking (add some drops directly into the half way clearo, If I don't like it i just refill and dilute those drops, if I like then 1 calculate the mix that I just made to the original recipe bottle (1 drop for half an evod is approximately 8 drops to the whole 4ml as I have already used 1 ml in the clearo.)) this tends to dilute a bit the strength of the nicotine but I don't really mind that
phase 4 make a big batch, I haven't really gone into this phase yet, I do like my juices but I think I like to try new mixes every time instead of committing to a big bottle yet.