just my 2 cents... but bolt-ons never, ever look or feel right. Even the very best of the best can only fool some of the people some of the time. even small boobies have a certain jiggle and bounce that no doctor has yet figured out how to replicate. If you were stuck deciding between small breasts that were unsightly for some reason and implants that would (theoretically) look more normal... then *maybe* it could be an improvement. But as you are, your breasts are fantastic.
Bigger is not necessarily better. Natural beats fake every single time, regardless of size. You are blessed with a pair of gorgeous, albeit small, boobies. keep them and know that lots and lots of girls are still very jealous of what you have. Any man who isn't turned on by your chest needs his pulse checked.