May I ask: why these three?

Absolutely! Lunette because I keep seeing it recommended over and over, and it's shorter than the Diva Cup. Sckoon because it's supposed to be squishy, and it's noticeably shorter. MeLuna because I see a lot of positive reviews.

From what I've been able to tell all 3 cups are shorter than the Diva, but around the same in diameter.

Fair enough! I think, from what you've told us, that Sckoon or Fleur might both be good options for you in the large size.

Truth be told, most cups are shorter than the Diva and might improve your experience... but these two seem pretty likely to work better than average for you.

Good luck. Personally I love my large Fleur. It's a very well-made cup.

Have you tried flipping your Diva inside out to shorten it? That might keep it from being pushed out. It's perfectly OK to wear it that way if it works better for you.

If you'd like a different cup, compare what you know, like and don't about your Diva to other cups using the size charts at http://sizecharts.livejournal.com/ or any of the others at the Community FAQ.

There is also a link to my Answers to Common Questions. Toward the end, there is a section on pelvic floor strength and what you can do to improve yours now that you've had some kids.

If flipping your cup inside out doesn't work consider the large Fleur cup. It seems to be a mom favorite.

And like kuradi said you may want to consider some exercises to strengthen your pelvic muscles.

I've been using the Diva flipped inside out since my second cycle using it.

I'll look into the Fleur cup and the sizechart. :)

Bothe lunette and meluna are pretty good from my experience but I can't recommend the sckoon cup. It is squishy and all but the quality is questionable. I've had really bad experience with the cup and the company lately. I have owned a few sckoon cups(different colors) but despite my low cervix they didn't work for me(too hard to grab at the base) so I sold them. Before I listed them for sale I noticed one of them is flawed. The silicone broke up like an open wound so I tossed that one away and sold the others. After a couple of days one of the lady who bought my cups contacted me saying the cup she bought had some kind of rough bump at the inside base of the cup. We both contacted the sckoon cup company, they refused to do a thing because the cup was bought almost a year ago even though it was never been used. They also didn't offer any explanation other than implying it was caused by misuse. I offered a partial refund but we are both very unhappy with the company. Later on I've read that such problem happened to a lot of sckoon cup owners and a lot of them have bad experience when contacting the company regarding this issue. I'm just happy that other sckoon cups that I sold don't have this problem but I can never recommend this brand any more.