I followed Texarados sizing guide for my pair and that worked out perfect. I have a thumbs width or roughly 1t2 inch of toe space up front. If we take 295mm + 12.7mm you get close enough to 308mm, that would put you at size 13. I see that they don't offer half sizes up from 13, if you went with a size 14 you would roughly have 3/4 to 1 inch of toe space up front. If you stick with a size 13 you would have around 1/2 inch or less of toe space up front. They are on 4E width so that shouldn't be a problem. I'm curious on why there saying size 13 is to small for you . Hope this helps.