My feet are the same as yours, except my left foot is slightly smaller than my right. I tried on a pair of G&G St. James in size UK8.5E at Leffot. They felt like rock-climbing shoes (i.e., very, very tight). No way they would work even with extensive wear and break-in.
Thanks for the info ambulance! Glad to see someone else had a similar experience to mine. I too thought there was no way they would work after breaking them in. I believe sizing down half will work for me. Cheers.