Anyone here run alot? I run about 3 to 4 times a week about 3 to 4 miles a day on a treadmill after my wieght training at the gym. I needed new shoes because my old trial running shoes (NewBalance 471) were making my arch's cramp up so I went to the local New Balance store to get a new pair of running shoes. The salesman had me try on a couple pairs with diffrent types of soles. I went with the 766 runners with cork insoles. They felt great until I ran in them my arch's didn't cramp up but I did get a huge blister on my left arch. Is this part of the breaking in process or am I running funny? Should I switch back to the soles that came with these shoes or break in the cork ones?