I got a Brooks B17 narrow right out the door on my Surly and something felt very wrong from the start. Finally I realized I was sliding forward to the nose, I adjusted it some, a few times...until it felt better but still I was sliding to the front. So today, I looked at this website and used it as a guide to help me adjust my saddle. It turns out it was the fore/aft position of the site; boy, did that make a difference! Now I know why Brooks has the reputation it does.

Here's the site I used:
http://www.jimlangley.net/crank/bikefit.html

A lot of you probably already know this information but it's useful for any noobs, like myself, to find the optimal position for their saddle. It takes a lot of time and patience but it's worth it.