I'm saying that this kind of pain has nothing to do with the saddle, so fussing won't help. The OP just needs to wait for his body to acclimate a bit.

This may be true for riders of average weight, but there's a lot of "there" between dem bones and the saddle, and a lot of weight put on the bones and butt. I have a Brooks "Bike Boom" era saddle from my old '70s Raleigh - it's padded plastic on a steel frame, and pretty good for the day, from what I read. I couldn't make it more than a couple blocks on the thing. The B33 is comfortable for hours in the saddle, but I also have an upright bike (Electra Townie, before that a riser and North Road bars on the Raleigh.)

For more aggressive riding positions, the B66 or 67 looks about right for a big butt getting used to riding again (or one of the competitors in the same vein, Velo Orange or Selle or Gyes)... you still get a bit saddle-sore for the first week or so, until you and the saddle come to an understanding, but it's going to be better than sink-or-swim with that plastic groin-gouger that comes stock.