I would use one of the 3 DC as DMC.

Counter ON?
yes

Attack both flanks .
start with mix and then observe - the rates of your wingers and oppo defenders.
Then if you 'll find a weak flag, choose that.
Also be careful with oppo AMR.
If he is good (in the game) , remove the arrow from your DMR

Remember formation is only the first step
Coaching is the second
(and luck is the third - lol)