I've tried on every shoe brand available in town. Shimano, Specialized, Bontrager. Not a big selection. Specialized were best. I have a very narrow heel as well. They did slip slightly when walking. I was told that was normal? I just dont I feel I can walk as needed in a traditional road shoe. Wish I had more selections locally. Wondering about Diadora, Giro, Lake, and Sidi (although they are very pricy)