I'm having the same trouble with my right breast being smaller than the left. 
I've been massaging it daily (going on a month) with a mix of Geranium Rose oil, Ylang-Ylang oil and Almond oil. Seems to be working! My right breast seems to fit my bra a little better!

I've been massaging it daily (going on a month) with a mix of Geranium Rose oil, Ylang-Ylang oil and Almond oil. Seems to be working! My right breast seems to fit my bra a little better!