For those of you using Brooks saddles what kind of seatpost are you using? I like Thomson Elites but with a Brooks there's absolutely no setback. I could swap out on 1 bike with no problem. My favorite bike has the infamous 27.4mm seatpost though. So Thomson was about my only choice in quality new seatposts. I don't want to swap saddles because Brooks are the most comfortable saddles my little arse has ever touched.
First, there is a Thomson model with some setback, actually slightly less than an old Campy Record 2-bolt offers. But with a Brooks it really isn't very much.
I really don't like to answer a post with a "Why do you need to do that silly thing, anyway?" reply, but please just consider this as a new idea. Been reading about bike fitting and design, and several sources say the weight distribution of a bike should be 55% rear wheel and 45% front wheel for best comfort and handling. I did some experiments and calculations and found I could get around 57/43 (improved from 61/39) on my Mondonico by moving my saddle (i.e. my butt, the biggest thing on the bike) forward around 3 cm (!!!). I did this, and it looks like the best seat post for this positioning is a Thomson straight post! I can't say too much about how it works since I've only had one ride, but I can still pedal with good power and no (less!) back pain. I do need to move my bars forward a cm or 2 to restore my arm reach. My knees are now a cm ahead of the pedal, but I'm not sure that matters.
I think I've been moving my saddles too far back. Could my new approach help you?
That said, I've gotten pretty large setback with Specialized saddles using an American Classic old style post. Might wanna get one (usually cheap) from Ebay and give it a try, but the 27.4 will be a tough search.
Road Fan