Why is my left breast smaller than the right? 11 months post-op.

I am 11 months post op from a Breast Augmentation. 3 months in, my left breast has always felt a little out of place and is now much smaller than the right. The left breast also seem to be flat and flimsy. While the right is more perky & full. I've expressed my concerns with my surgeon and she insist that my breast look great. I must admit they look great with a bra on, but bare it's such a huge difference in size to me. Could there be some scar tissue causing the left not to drop? Please help