I reviewed my notes (I kept recipes and some tips from a professional on a now defunct food forum that doesn't allow access anymore - what a waste of knowledge, recipes, and stories).
Unfortunately, I didn't keep any notes regarding fresh herbs, but recall the herbs get bitter around 3 to 5 days (so your timing and plan with the dropper is spot on). Then remove herbs and ideally let mature/mellow for about 1 month.
A little citric is needed for balance and other reasons (preservation of color), which doesn't disrupt the flavor. A teaspoon of lemon juice is common since lemon is least likely to disrupt (but lime and grapefruit is common depending on flavor profile(. I always used a pinch of sugar (sometimes white, others brown or a mixture) for balance too, but it is not necessary.