Would I benefit from a breast fat transfer?

Based on the pictures you have submitted I would say you would benefit greatly from fat transfer to breast in addition to some removal of skin from the side of the breast. I think this would contour your abdomen nicely and give you an size augmentation of the breast that would be appropriate for your body type. Removing the skin from the side of the breast will improve the contour and adding the fat will give additional volume.

Fat transfers will provide a modest increase in volume as well as some improvement in shape and contour. Removing the side flaps will improve the contour but it will extend the scar towards your back