I use 10 arrows, all red + 2 blues for the DC's.

As I always say, all affect slighltly in the game. Players will defend when is needed, and attack when is needed.
A player ST with red arrow can save a ocassion against and appear in defense, so I think using 8 reds in the attacking moments the game have more players to select to stay in attack avaliable... is my idea, the DC's tend to stay like statues and they do a good job + in defense actions even all the others have red arrows, thats football and the lines have to go one stap back, so defense, always will be here, attack, how more options better.

As said all is a sligthly % hat affect, this % + the internal base of the player, that can be a MC but that work more in defense + the % of the match scenario, that can make this player more determinant, less, be a failer that provoke a penalty against... be invisible and you dont see the name during the match, or, be more decisive in attack than often and save you a match...