4th time barefoot running. Love it but 2 of my toes keep Rubbing on the concrete. And it burns to the point where I have to stop. Its only on my left foot. Is that because of the way I place my left foot? I read a post that I should place and pull. My right foot glides smoothly. But my left feels awkward. It doesn't smoothly glide like my right foot does. I'm brand new to running in general. Injured myself big time running with shoes. Oh and I'm flat footed too. Every time I tried to run with asics made for my flat feet I would injure my knees. In shoes I would feel forced to forefoot strike. Barefoot running is the only way I can run where I don't have a knee injury. my knee feels super good. But my left toes keep Rubbing on concrete. Any tips to help me with my left foot striking?