I've recently been having trouble with having one of my breasts pumping enough milk out while at work. I can tell there's still milk, but it's not coming out. I currently am using pumping pals biggest flange size (which I used for my oldest). Only one stream comes out while pumping, too. I think my nipple/areola is kinda big still for this? I'm using the middle sizes pumping pals flange for the other side. What can I do to help pumping it out?