I'm currently using the Medela Sonata pump its a new closed system pump all the parts and tubing are different from other medela pumps except the flanges. I use the 27mm flange because the 24mm is definitely too small but the 27mm hurts too and it seems like too much areola gets sucked in. There doesnt seem to be a size in between these two. Does anyone else bave issues finding a comfortable flange size?