Yeah, I'm curious on this too. How long does this "dump" feeling last? I'll kinda get that before spacklin up on the Chamois Butt'r (****ing key for any ride over a couple hours) but it never lasts more than a few minutes and then I'm distracted by birds or bosoms or whatnot.
But that's not really addressing the issue.... I think even changing shorts wouldn't help a such regular numbness. I'd keep that nose up, the back part should be almost flat. Do you have any wrist soreness? If that saddles angled down too much it'll slide you forward (slowly) which'll put pressure on the wrists and the taint.
I commuted about a month on this:
Which looks crazy but I was trying to get the whole spinny thing (easily amused over here), so compare that seat angle against the (normally horizontal) top tube. (Yes, the bike's about 2" too big for me.)
Good luck, they're great saddles....