Before taking any drastic steps, try loosening the tension nut 1/2-1 full turn. I have 3 Brooks saddles. Two were comfortable right out of the box. After 500+ miles, the third still didn't feel good. I turned the tension nut back 1/2 turn & it was immediately better. Another 1/2 turn & it felt as good as the other two. The thickness of the leather will vary ever so slightly between saddles. The tension may be slightly different as well. Don't be afraid to experiment.
Word of caution: Don't tighten the nut any. That is almost never a good idea.
Good luck.
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“He's all over his machine” - Phil Liggett