Is it true that my breast tissue was too small for 300cc round moderate silicone? I'm 30yr 5'3 115lb, no kids.

I'm 5'3 115lb with what I thought were tuberous breast, although my surgeon doesn't like to label things. My goal was normal looking breasts and actual boobs. Pre-op I tried on moderate plus round silicone 300cc and 350cc- liked both but leaning toward the bigger. I came out of surgery with 250cc on right, 275cc on left high profile. When I questioned he said my breast tissue would allow any larger than those and that he made the best choice for me. I'm disappointed they seem small, what can I do?