Is the B17 too wide? That depends on how high the handlebar is. With a higher handlebar, your pelvis is more upright, so a wider part of the "sit bones" comes to bear. If you like a fairly low handlebar, you'd probably prefer a narrower saddle.
What happened to your "short-lived Selle Anatomica saddle"?
My handlebar is a bit below saddle level I think. See the picture below. I generally ride 1-2cm below the saddle but I have one of those adjustable stems that come stock on a lot of Jamises, so I'm constantly fiddling with it. I like how it is now, though.
As for the Selle Anatomica, it was very comfortable from the get-go but I was worried about longevity. Every one of them I see in the wild just seem totally bedraggled. In retrospect, I would try one again, but at the time I was spooked by a few I'd seen that had stretching problems. I'm 145lb, so who knows if that would realistically be an issue, though.