Noonievut

I know saddles are very personal and YMMV. However, I had what I consider to be a more general question...we'll see ;-)

I've been riding for over 15 years, road and gravel, and average 4-5 rides a week, 1-3 hours per ride. I've had numerous saddles before, and currently have Selle SMP. I had a professional bike fitting last year, using this saddle, and I'm generally happy. I don't have any numbness or sore bits below. Although on longer rides (4hrs or so), I often get what I would describe as sore sit bones. The skin is fine, no redness or chafing marks. I use good bib shorts and chamois cream. I'm wondering if a firmer saddle (leather), would be a mircale cure for me for those longer rides. I don't think so, but I'm curious as to whether firmer (hard) saddles that don't have padding, like Brooks (which I've used) and Selle Anatomica, might be the ticket.