I have a narrow foot too and at least for me its kind of a funny thing. I went down half a size on every single pair i have. With that being said i noticed something. With both of my Primeknit pairs they fit perfectly half a size down but with my regular pairs they took a long break in time to...
I wouldnt worry to much. Think about it... its an Adidas shoe and adidas stores didnt sold it but footlocker did? I would expect a wider release at some point. Maybe playoffs time or if he wins MVP...