Another Seat Question

I am fairly new to ridding and now have a MTB and a road bike and ride several times a week. I spent a considerable amount of time attempting to dial in the seat position on my MTB and basically just duplicated those on my road bike. I have things set up now so that everything works, almost. I still work my way forward on the seat and eventually find that I am off the seat bones and sitting on the wrong parts. I move back an inch or so and continue. The same thing happens on both bikes.

I was wondering if there was a seat available that had a more pronounced "home" for the seat bones. I mean just a slight depression in the back part of the seat where they, the bones, are supposed to sit.

Mark