Try the Specialized Body Geometry line. I'm more than happy with the 143mm wide Henge Comp. For context, I'm coming from a Fi:zi:k Gobi, excellent for the short, technical rides, but a butt killer on multi-day escapades, and when confronted with WTB saddles I had the same impressions as you about the excessive hammock shape.
At first touch the Henge will surely put you off, as it feels sturdier than it does when sitting and mashing on the pedals. When in movement, the foam naturally conforms to your anatomy and the flat top helps you move forward for that extra push in those heavy climbing sections.
Just mind their excessive (to me) height from the rails to the top of the saddle. I had to re-adjust the seatpost after putting the Henge on the bike.