I just bought a pair of pegasus 35's and i've run in them about 6 times, each time after about a half mile my feet begin to ache. If i stop for 30 seconds it goes away but when i resume running it comes back. What could be causing this pain. The shoes fit perfectly with about a thumbs length between my toe and the front of the shoe and width wise they fit well. I had this same problem in my 34's but it went away after the first run.