How important is this foremilk/hindmilk balance. I am currently an exclusive pumper and i have an oversupply. I pump every 3 hour for exactly 15 min. I noticed that when it get to 14 min, i have another letdown. i know that i am suppose to pump until empty (drop by drop i assumed) which is pass 15 min. I am scare if i go pass the 15 min (pump more = more milk) but if i don't let the 2nd letdown be done with, i am not getting hindmilk. So, how can i get this balance without over producing??