The thing is.. if you play attacking you shouldnt be using blue arrows.
If you play defensive you shouldnt be using red arrows.
probablly simply as that..
Attacking, most of ur players are trying to attack and if you used blue arrows on some of them they'll go harder and make a foul to stop the counter attacks instead of just takling as they usually do.
You can't take fouls to ZERO but you can reduce them significantlly if you follow this
I've been testing thoes on 6 teams and that's what i've seen :P As i could have tried most of the tactics and see what changes..
Spent about 4 hours this evening to analize everything haha