Mario Gomez from Bayern Munich should get a boost. He has only 3.5 star ability/potential yet he is the top bundesliga scorer, and the top Champions league scorer (tied with Messi).
He should have an increase in: composure, agility, finishing, and technique as he can get them in in tight situations and when surrounded by defenders. Anticipation also as hes a first class poacher.
Also for Liverpool, increase Skrtel's marking, speed, tackling, and aggression (he looks angry). In the game he becomes bad and unused while in reality he is practically part of the starting 11 in almost every game.