I had a brooks without springs, and found i could ride up to 50 miles and then i started getting sore.
So I have a b67... no more problems. Don't get me wrong, after 100 miles
you don't want to sit on ANYTHING, but at least it isn't injuring me!

I put my saddle on someone elses tandem bike (for a little race i was in)
and the saddle was in the wrong place. I ended up chafing quite a bit. Since i'd already been using that same saddle since May I knew it was NOT the saddle.
It was too far back, i think..

so maybe your saddle is not in the right place.

Oh, one more thing. Leather is not like plastic in that no two saddles are really alike. We had one B17 which was REALLY hard. my DH could not break it in. We sold it to a 250 lb guy. he loved it.