Tilting cup...argh!

I've been playing around with my size 2 Diva Cup on and off this past month and every waking half-hour for the past 2+ days. It's quite the effort to get it unfolded, as well, and I've tried a number of folds.

It keeps tilting forward, then unseals itself and leaks from the back. I might get it in there, but the minute I stretch any part of my lower half, it starts tilting up. For instance, I went bed with it and this morning, the cup was tilted, dislodged and empty, but there was blood toward the back end of the pad. I've tried giving it a little more towards the back, but it reorients itself and tips forward (I ended up snipping the stem some because it poked, too).

Otherwise, I try to push it up farther and it ends up sucking up inside me and I have to do some two-finger spelunking to get it out.

Any ideas to get this thing to work?