My Brooks was stubborn, somewhere I read this, and it worked for me:

Moisten a face cloth, put it on the saddle, and ride for an afternoon.
You will do two things, the moist facecloth/towel, will dampen and soften the leather
and allow it to 'mold' to your shape.

Yo also will probably get chafed, red, from riding around on a wet face cloth for an afternoon
but you will fast forward a break on a hard new saddle.

It worked for me.

Cheers

Marc