saddle nose up, saddle nose down. As weird as it sounds, don't be afraid to actually raise the nose on your saddle. Of course, we work primarily with Gilles Berthoud, Rivet, Brooks and other leather saddles so by tilting the nose up (slightly) is puts the sit bones where they belong and keeps the rider from sliding forward onto to the nose. My nose is fairly level, maybe a hint of an upward tilt. My DH's saddle nose has an obvious upward tilt. Yes it sounds counter intuitive but don't rule it out as a possible solution.
When people come into our shop complaining of saddle discomfort, that is the second thing we do (after measuring sit bones)
Sky King
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Gilles Berthoud "Bernard"
Surly ECR "Eazi"
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