Hello and thank you for your question. Honestly, a formal in-person evaluation would be needed to determine the best treatment. There are several reasons for this:
1) Bra sizes vary based on the clothing store (for example, Victoria's Secret tends to upsize everyone by a whole cup size)
2) Most...
For the record one tablespoon is 15 cc's, so 20 cc's isn't that much more. It is very difficult to determine the exact size and shape implant you will require to best match your ideal breast image without an examination by a board certified plastic surgeon. Not just any board certified...
I prefer to choose breast implants that match the breast base diameter. according to your measurements a 350cc would be a better match for you. The 425c is a large implant and your concern about looking "matronly" also suggests a smaller implant than 425cc may be your best choice. For more on...