You are not using your striker for the free kicks????? Seriously? I want to know how the rest of your teams looks then. It is one of the best features for a striker. I have had a 7 star striker with FK SA and used him for over 6 seasons now and is on 300 goals. Instantly use him for that. Your AMC is not bad, just average but give him a season. Sometimes they have average season to shine the next season. There is no direct way to improve him unless you will train him in certain aspects maybe.....