Adjusting that saddle is real important. There is not a real formula. I have noticed that moving the saddle forward or back just a few millimeters has made tremendous changes in my ride now that I am a geezer. Same for degree of angle on the nose of the saddle. Same goes for the bike set up. I have two bikes set up exactly the same using measurements between seat, crank, and bars, and the saddle position is different even thought they use the same saddle. Of course one is more of a gravel bike then the other so there is a big difference per say.

My suggestion is don't think too much about it and just continually adjust your saddle till ya find your sweet spot... then ride, ride, ride... Happy Happy, Joy Joy...