Jenn - an unusually high arch also typically means a relatively stiff arch. This allows for less shock absorption. This in turn can lead to the spur. Your focus should be on stretching (I know you already said you're doing this but I felt I needed to say it again because it's *that* improtant) and getting shoes with very good cushioning. This is especially true of walking and running shoes. Cycling shoes aren't designed to reduce shock. You may want to try to put a gel insert in them and try to increase your cadence. Faster cadence = decreased force per pedal stroke.

