The J Crew Perf CT Boots are more snug than other Barrie lasted boots. I have the PCT boots and wingtip boots (color 8 and ravello), all on the barrie last, and the wingtip boots fit pretty close to my 975, 9751, etc... I think the J Crew PCT boots are more snug than the others. I do not think you have to go with an E width. Of course, trying them on in person can provide definitive answers.
Thanks for this. I ghink the 10C probably would work and allow for a thicker sock. We'll see