It's better to "study" your oppo formation and then make yours.
If your rival playing a 4-1-2-1-2 (narrow diamond) or a 4-3 (nd)-3, there is no use to have DR & DL.
You can set 3 DC and one DMC.
I agree with Gert about those arrows.
I 'm trying to avoid red arrows. I 'm using them if I 'm behind in the game score.
Also, only in that case I use attack ment. I 'm starting with defense mentality and counters in every game.

Cheers "patrida".