This is really important, especially if we're switching positions throughout the night. Take the extra minute to change your VP's position and role to something suitable to where you're playing. You might be able to get away with using some of the midfield builds while playing in defense, there's no reason to playing back there as a forward. Also, 5-8 to 5-10 is the sweet spot for maximizing SPD/ACC/AGL, so unless you're playing thru the middle and know how to use a bigger/stronger player (and much slower), it's probably best to keep your guy in that range.
You are scored on your positioning throughout the match and it can eat away at your rating. If you look on your player performance screen, you'll see the number of times out of position. It is tied to the formation/tactics, and if you want some help, watch the indicator under your player (assuming it's on, of course). The more chevrons you see, the further away you are from where the game wants you to be.
Turning the ball over will really drag your rating down. Not only getting tackled, but incomplete or intercepted passes as well... like all the hopeful thru balls we're all guilty of forcing. Conversely, winning the ball back and completing passes will see your rating creep up. At its core, the rating system encourages playing your role and not giving the ball away. Of course, banging in a few goals will spike your rating, but to consistently keep your rating up, avoiding mistakes is the key.
With all that being said, I thought you played well at CDM in the couple of games we played together there. You were aggressive, but you seemed to have a good idea of when & where to go. I think the biggest thing to work on, and it applies to everyone, is limiting turnovers by being more patient and making the open passes the defense gives us rather than forcing it.
And you really want to avoid holding sprint while receiving the ball. It almost always results in a clumsy first touch, and in pro clubs, that usually means losing the ball. If you're running, lay off R2 long enough to control the ball, and if you're standing still, try holding L2 when receiving to really kill the ball. It's helpful in tight spaces, like a striker with a defender on his back, or when receiving a cross-field lob you need to control quickly before the D closes you down.