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Good question!
In my experience, the purpose of the saddle is not(!) to act like a cushion between your butt and the bike, but to support your sitbones. Excessive padding will adapt/mold around your soft bits and create pressure on flesh and skin, which then becomes sore.From what you describe, about bouncing on the saddle, maybe your seat is set a little too low?
I've found that when I've set my saddle at an approriate height most of my weight is supported by my legs and not the saddle.
Why would you say extra padding is bad? I think extra padding or some kind of way of absorbing the bumps would have really helped on my tour. On the smaller tarmac roads that were really bumpy, the problem was I kept bouncing on the saddle, which I reckon more padding would have mitigated.
My budget won't stretch to a Gilles Berthoud, sadly, but that Velo Orange Touring looks interesting.