Well I finally gave up on those damn "soft cup rings" and decided to give this a try last night, with the help of my handyman BF. It worked great, only problem is, I definitely see what you mean about needing to shave off some of the insulation on the inside of the cups (did you try pumping without doing that?! Hello tornado boobs and INTENSE nipple pressure! ouch!), but my problem is -- I don't have a CLUE how to go about "shaving" off the foam!! I tried with a nail file... nothing. An exacto knife... no way (left chunks ripped out and nothing else). I am now trying literally shaving it, with a razor. Tiiiiiny little fluff of foam get shaved off, but this does not seem like the way to do it! It will take forever at this rate!
So Mel, or others who have done this successfully, exactly how is it that we're supposed to "shave" these darn things? :-/