IMHO, if a particular Brooks saddle doesn't fit you reasonable enough straight out the box, or after several hundred miles, I see no reason to use it.

The comfort in a Brooks saddle isn't caused by soft leather, but by a hard leather shell that flexes. The modern carbon saddles that are extremely hard, use the same principle. Indentations may distribute pressure even better which also helps.

Treatments such using lots of oil etc. just ruins the leather (clog the pores, makes it too stretchy, or brittle etc) without any good chance of improving the comfort. Experimenting with saddle angle (start with flat nose), height (as high as possible) and rear offset (move it way back), may produce better results than various voodoo treatments.

--
Regards