Vibram Five Fingers Men's Trek Ascent

I own many pairs of VFFs and, except for one style, every pair is the same size. Every style is different and they each have their own feel. However even though I take these in my normal size, they’re uncomfortable and just don’t fit the same as my others. They also create blisters in two places on my feet. I assume they’re cut differently, something different in the mold they use to form them. But whatever the reason, these are my least favorite VFF style.