thin cup

does anyone know of a chart that lists the length of the bottom of the cup, not the stem. i have am trying to figure out which cup to get next because my large yukki isnt working for me. on my heavy days my cerxis is very low, i have shaved my cup down as much as possible so that nothing sticks out of my vagina, but it still protrudes a little, so im looking for a cup that is as thin as possible on the bottom...but still has lots of room inside.  i have tryed turning it inside out and that helps a little, but it still stickes out a few mm and irritates me till i want to scream at something(usualy the kids!)