That's a big problem with a lot of people... they should make cups in smaller width increments... Do you use the silicone rings? You could buy a medium kanghzu cup with the silicone rings and its a smaller opening than the Noogle medium cup... pretty sure.... check the thread on dome size database for the exact sizes... I've also played around with using a heat gun to change the shape of the dome.... which is an option unless your planning to resell it later.
www.breastnexus.com/showthread.php?tid=19940
www.breastnexus.com/showthread.php?tid=19940