It may sound counter-intuitive, but you may want to try the saddle with just a bit of nose up angle.

It sounds like you're riding the saddle way too forward, and angling the nose up a bit will help with that. Your sit bones should be in the wide part of the saddle near the very back.

I recently got the SMP Pro, and I'm still getting used to it, but most of my problems are when I end up too far forward on the seat, so I have to remind myself to stay on the rear.

As far as the cousins go, I haven't had an issue with mine, because the saddle is narrow enough that when I place them correctly in my shorts, that they would be on either side of the saddle and out of the squish zone.

Of course, not every saddle or brand of saddle is for everyone. Since you haven't tried nose-up, try that for a few rides, and if it doesn't help you stay where you're supposed to on the saddle, then try a different saddle or brand.

GH