So I am a 34D and based on size guide (L said 34 A-C ?) I took a guess and bought XL contoured system. My breasts fit the circumference of the cups almost perfectly...what I mean is it seems to fit fine but when I start to pump air still escapes. If I purchase the silicone ring will that eliminate the issue? Should the cups be fitting a bit tighter on the breasts and I should size down? How drastic of a jump is it between cup sizes? Is the contour shape really better than the normal? Also altogether the cups are so heavy on my small frame they won’t stay on, please I could use advice!