If your opponent got a DMC, you shouldnt use a AMC. Cuz the DMC disables him.
If he got strong MIDDLE (DMC, 2 MC, AMC) i play 4-5-1 v. To disable his AMC and be able to play on the flanks.
Example:
If he plays:
DR---DC---DC---DL
-------DMC--------
-----MC---MC------
--------AMC---------
------ST----ST----
I play:
DR---DC---DC---DL
--------DMC-------
----MC------MC----
AMR------------AML
---------ST---------
U see what i mean?
Always try to **** his attackers, but still be able to attack in his empty spaces. Never try to attack there, where hes the strongest.
And dont give him much free space, always try to disable his attackers.