i agree with strengthening the intrinsic muscles of the foot a great way to achieve this is to practice navicular lifts and navicular control during squats and lunges the other two points i would like to make; is assess neural entrapment points that may lead to irritation of the plantar nerves and arthrogenic pain generators that can cause neural irritation. and second assess the function of the three stirrups of the feet. tibialis anterior and peroneals during heel strike then tibialis posterior and peroneals during weight bearing and extensor digitorum brevis and peroneals during toe off the function of the stirrup slings about the feet are imperative for proper function and control. in addition myofascial release of these stirrups have been very helpful and self release with foam rollers are an effective method for self management of their condition