That's not far off from mine either. On my B17 my sit bones were even closer to the edges- that's why I got the B68. Even so, the B17 was comfortable after the first couple of weeks of heavy riding.
Now on my B68 my sit bones are like where yours are. I think yours will be ok after the saddle -and your behind- are both "broken in".
Have you proof-hide-ed the saddle much yet? That really helps it soften and form to you. Proof hide several times, on both sides (top and underneath).