Here is a quick mod. I tried to make the small boobs look rounder and less pointy. Screenshots done with 15% to 30% boob size on medium height thin girl.
 


Instructions on how to apply the mod:
 (1) Unpack the file jce01_00_00.pp with the pp decrypter I uploaded earlier. 
(2) Replace the xx file with the one from the 7z archive I attached. 
(3) Repack the pp file.
 
I hope you like it. If you would like to have some other changes let me know.
 Be warned that breats sizes < 12% will not look good with this mod.
 
The xx file includes other modifications for bigger breasts as well. You can have approximately 140% breast size when you move the slider to 100%.
 The file will only do changes to the medium sized girl!

jce01_00_00.pp