whether or not there's an evolutionary reason for my boobs to be different sizes.

My personal theory...if you are right-handed, then the right one is a bit smaller, and vice-versa.

Oh, and I am jealous of firmness vs jiggles moreso than size. I have always said that there are 2 types of fat...solid fat and liquid fat. Think Crisco and vegetable oil. I was blessed(*cough*) with very runny, jiggly liquid fat. I have seen people much larger than me that don't jiggle, and occasionally a super-skinny person that jiggles like me.

I am a woman because it suits me best!