I just played cup against the opponent who used 3N-5-2 Flat and I used 3N-2(DML-DMR)-3N-2 and I lost miserably 2-0 in my home even i'm stronger in both rating and Starting 11.

Anyone who ever succeed beat 3-5-2 Flat in big score ? I need at least 3-0 to pass through next match in cup.
What formation is that?