Ah, man, I can't even begin to say how bad an idea it is to start out at 30ml's...I've thrown away way too much crap mixes to ever think about starting with that much, but maybe you are much better off with money supply than I am.
If you want to go fairly large, but still not put 30ml on the possible drain coating list, then drip 88 drops of your 6mg base into a clean bottle and add 12 drops of the Capella flavor of choice. Shake, drip on atty, taste, add more flavoring if needed and repeat as needed. When you get close, stop, set it aside and try the next flavoring and repeat as needed. Sometimes the flavor can get stronger if it sits for a few days or weeks and if you hit one of those perfectly on the first go-around, it will taste like too little flavor after it steeps.