Hi,
with an unpsrung Brooks, the seatpost should grab the saddle somewhere near the middle. If it doesn't, it won't work like it should. There are many approaches to breaking in a Brooks. I
melt a tin of Proofide with a hair dryer, and for a minute keep swabbing the stuff on the saddle. You need to use the hair dryer on the saddle a little to keep the stuff liquid. It soaks in better if it's liquid. I put extra on the edges to try and discourage wicking.