I have a very broad chest with a bwd of 17cm. I am trying to decide what size implants to go with and I am confused as to the volume because at some point there doesn't seem to be much difference in projection. A Mentor moderate profile 510cc silicone implant has a projection of 3.7cm whereas an 800cc implant has a projection of 4.1cm. That's only .4 cm projection difference, but 300cc's volume! What's going to be the difference in the look under my skin or in a bra?