I have a new tip for you :
I changed my tactic to a hard attacking one. So the last two matches this player named Guajardo has performed great skill after changing my orders on tactic as he is getting much more balls in his zone. Last match he scored 4 goals against the number 3 of the League table and a form of 9. The previous match he has performed an 8 in the champions league scoring a goal again.
So I am not telling you that you should set your tactic to hard attacking but apparently some players are made to play a highly attacking type of play and others perform better on a defensive type of play.
I hope that helps