in general, I tend to have an over supply. If I pump in between, it just goes out of whack and I end up with colicky babies, a freezer full of milk and mastitus!
I rec'd excellent advice about massaging the ducts, feeding on one side only initially and not pumping too muich, so I am able to keep the supply from going crazy, and only had a small bout of colic this time around.
BUT, one size is definately more over active than the other. If I get even remotedly engorged, the milk pours out and will continue to squirt for as long as 30 seconds after baby has broken the latch.
Result is, baby take a suck then pulls off, takes a suck, then pulls off and so on, making me sore. There isn't even enough time for me to get my finger in there to break the latch properly.