My 19 y/o playmaker MC Players form was always 5-5-5-6-4 but since i made him captain he consistently gave 7-7-8-7-8 sometimes 9 or 6 ,he was captain for the last 2 seasons.... So you should try that out....and BTW some younger players take time to give consistent performances.. last season my 18 y/o player was pathetic but this season he is notching up quite a few goals and assists