Bontrager saddles are famous a** hatchets. They know you'll get rid of it, 'cause every butt is different, so they don't spend any money on it. Terry Fly or Specialized Avatar work well. Brooks and the Brooks-with-slot work perfectly for some, but not for all. You've already been measured, so you know which width of Specialized is right for you.
Yes, a firmer saddle is the answer.