Springs are nice. No padding is VERY nice. Keeps pressure and impact off the tailbone. Flat top contour should be as comfy as a wooden kitchen chair, and you'll be on the ischial tuberosities and OFF the sacro-tuberous ligament and coccyx.
I highly recommend a Brooks B67 (or B67-S if you like short noses) for pelvic and spine issues. Haven't had a patient yet with your adventure, but I've had a couple with fractures. It seems like the needs would be similar as far as saddles are concerned.
Mind you, the Brooks B67 is mighty wide, and could be too wide for you. But the extra acreage might be perfect for getting you off any nerve-damaged areas and keeping your tailbone and associated ligaments suspended high above the surface of the saddle.
Wallingford Bicycle Parts gives you 6 months to try a saddle, full refund if you don't like it. www.wallbike.com
It might be worth a try, and you'll only be out the shipping cost if it doesn't work for you. http://www.wallbike.com/B67.html (scroll down to the bottom of that page: the lovely lady with the tandem is Team Estrogen's very own MimiTabby!)
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson