Here's a quick story. With my advancing age, the 'racer's posture' on the bike hasn't been succesful.
After recovering from some old injuries,
I'm back on 2 wheels, going at a moderate pace for as far as possible.
The wonderful Brooks Pro has been retired, it wasn't cut out for sitting upright.
I've bought a Brooks Champion Flyer, and after messing about for a while, solved the problem.
1. I softened the leather, using a little Proofide & a small amount of Bick liquid conditioner
(an American product, meant for moisturizing and cleaning boots and saddles.
Surely a substitute could be found at a tack shop ).
This made the saddle TOO soft to ride, but overnight ithe saddle resumed its normal tension,
but was much softer. When I rode the saddle,
my weight made the leather ride on the upper rails of the sprung saddle.
2. I put 6 lacing holes on each side, beneath the oval stamp, and added a boot lace.
I laced the skirts loosely, tied it, and tucked the lace up inside the rails.
This prevented the skirts from flaring, and the seating surface from resting on the rails.
3. A short ride proved I was still sitting on the upper rail,
but the saddle did not flare out. Using the Brooks wrench, I tightened the saddle a 1/4 turn,
and tested the seat. Three tries found the right tension and give a splendidly comfortable ride.
4. As the leather stretches, and I'm sure it will, I will use the lace and Brooks wrench to correct the tension
until the saddle stretches too much, and it may or may not ever happen.
But for now, I have a plush ride and can cover miles without the strong shoulders of my younger days.
NOTE: my handlebars are level with the saddle, and the nose of the Brooks is ever so slightly raised.
I think riding position, and anatomy ( leg length, arm length, as well as the naughty bits ) account for the exact attitude of the saddle.