LPH, are you kick-and-glide skiing or skate skiing? Do your ski boots have stiff soles or flex at the ball of the foot? I don't know how these things would affect your foot pain, but seem like useful information for a diagnosis. I ski in leather 3-pin backcountry boots that flex at the ball of the foot but are otherwise pretty stiff and have not had foot pain. Well-worn and overly-flexible boots will certainly make skiing harder on your feet and decrease control. Maybe rent some different boots and see if the pain is the same?