One piece of equipment that will help you in this quest a lot is a seatpost that uses 2 bolts, front and rear. With these posts, you can go for rides and mid-ride, adjust the tilt by (say) backing off the rear bolt 1/4 of a turn, then tightening the front the same amount to bring the nose down a little. That didn't help? You can go exactly back to where you ere before. Or add another 1/8 of a turn. With seatpost clamps with one bolt, you risk losing all your references adjusting them on the road, but it is out on the road where you are going to find what works.

Be sure to note the setback of your current seatpost. Setback is the distance from the center of the clamp to the center of the seatpost. "Traditional" is around 2.5 cm. The popular Thompson posts have zero or low setback. A seatpost of different setback may limit your ability to get the seat where you want it forward and back. (I like seatposts with setback that allow me to center the clamp on the seat rails. This allows moving the seat quite a bit to dial in the best position.)

Seat comfort and position is THE MOST IMPORTANT fit issue on a bike, by a lot. Don't get discouraged. Don't quit this search until you have a seat you can sit on for hours, that is almost as comfortable as your favorite chair. And don't be surprised if that seat that works isn't what that guy you respect so much rides. Listen to what others have to say. But listen more carefully to your butt. Butts don't have eyes. They are amazingly unimpressed by the status of your seat or its price tag. But get that shape right and your butt will thank you, many times over.

Ben (I love the Terry Flys. But they aren't for everyone.) Edit: But tensioned leather seats with the rivets in the nose are, for this guy who slides a big distance forward and back, torture. When my bike with its very high quality Japanese seat I had ridden since new was stolen, the rest was sad, but when I thought about the seat, it was "thank you".