Evaken,
I am the same as you, one side can pump much more than the other side. I am already like this when I have my first baby, so I dont really care this time. The smaller side also have more milk leakage, I have to replace the breast pad more often.
M come is good la. Last time after I had my son, my M didnt come and I wasnt alert enough to do contraception, ended up I was pregnant again 5 months after giving birth. If your M already come, at least you know when is the "dangerous period" and could to contraception more effectively.