I bought these because they come with foam inserts to help collect leakage. I'm a 38 DD and use the large flange for my medela pump, so I too found the sharp edge that contacts the breast was cutting into my sore areola/nipple. The ameda shells had a round edge and were much more comfortable, although leakage city! My sore nipples got nearly instantly better using my brest friend (great proper latch!), and treatment for a mild yeast infection. Hope this helps.