Hi Kim hon, well then I can safely say that after 8 years HRT and you still haven't reached a satisfactory breast size then breast augmentation might be required but consult a physician for recommendation before you do.
It took mine five years to get up to a 36B but then at my age I can count myself lucky I even got up to that size. 36B is about average for a person my size anyway. Good nutrition and a good diet is all I can say was what helped me to fill in to a better shape.
Cindy