Brooks and other suspended leather saddles need to be leveled at the nose, not across the saddle as a whole.

When looked at from the side, the cantle plate should be slightly higher than the tip of the nose. The nose itself will be level its entire length.

If a suspended leather saddle is leveled across the saddle as a whole (cantle plate and tip of nose the same height viewed from the side), when you sit on it and the leather gives under you, the nose is essentially too high.

Then it will feel like the nose is digging into you, especially at the front.