I agree that they run a bit small. I have an older model of the Tahoe but I still had the problem with foot burn in them. I have extolled the virtues of Keen cycling sandals here before so won't do that again, but the Spec. Tahoe is a really nice comfortable shoe for riding and walking....I just couldn't wear them over 30 miles at a time (I was using them for road and MTB).

Try them on if you can since you say your foot is narrow. Good luck.