Boy, I just don't get it. I just rode 30 miles on Friday, on hills and flats
I wore not my best pair of shorts; maybe my 3rd best, it was hot enough that i got quite wet from sweating and I had no abrasions and very very minor sit bone soreness.

I ride on a barely broken in Brooks b67 and I cannot understand why the saddles so many women have on their bikes are abrading and hurting them.

You sit on a chair all day (well, most of us do) the pain in your butt after a 4 hour bike ride really shouldn't be more than an order of magnitude worse than that, and only because you can't move around as much on the bike.

If you are still having these issues, I'd say the saddles they are offering you are not for you (I hated the terry butterfly too) and you should try something else.

After 2 hours in the LBS, they should have done a bit better with you; good luck!