When I read your treatment,physio237, something creeps up my mind; friction>pain, massage gluts> hyper tone and instability of foot. one connection can be made: The lumbar spine! It has not been mentioned in this case so your problem will continue. I refer as well to the original question, though.
You have to establish if there is a neurological conection between the different symptoms; Glutei (Both Hypertone) and Tensor facia Lata. Mechanical effect of hypermobile joints in the foot on the back (and the knee).