I appreciate all the tips so far ladies.

I had assumed that sit bone distance had something to do with hip width, but obviously that's not right. So thanks for giving me the correct information!

Regarding Q-angles, hmmm, I've got a goniometer in the house. I'm guessing that might help a bit? Plus I do know a therapist pretty well...

I do have severe overpronation which I think can make for some pretty distorted hip movement. Although I do wear custom orthotics and remember the PT mentioning that my feet were the reason for the odd hip motion.

Regarding the cutout test - admittedly I've never heard of it (maybe I should have?) - so I need to learn more about that.

As you all noted, it probably helps just to try some different saddles to at least narrow down my choices and/or get a better sense of what works (and doesn't work).