I have outside edge issues, a guy I played with watched me skate, and he said I was to far forward on my toes, he said, put your weight into your heels (now I know you have to be in the seated toilet position and I thought I was) however just that simple way of saying where to put my weight clicked, followed by some simple outside edge drills has worked wonders, I feel more balanced. So it could be something as simple as that. I have a pair of old Nike Cortez, and they are very worn away on the outside of the heel area.