Brooks don't need to be broken in. Yes, they get better over time, but they should feel good when new, or something is wrong.

Every spring I have to ride enough to condition my rear to take the chaffing of riding. If your problem is chaffing, then I would look at clothing rather than saddle (unless the saddle is literally rubbing you wrong). Try some padded bike shorts, make sure they are clean and dry, and use a little chami butter to help break in your rear.