I ordered these boots in my usual size, but had to exchange them for 1/2 size smaller. I hated to have to send those back as well. They were too wide in the heel and slipped up and down when I walked.
I do have a narrow heel and foot, so I tried putting some padded insoles in to take up the extra space, but they just didn't work. I have other Clark's boots that fit well, so I guess these just run a bit wider.