I tried this formation for some days and it worked.

But I just think about replace DMC by a MC and it turns to 3n-2(DML/DMR)-1-3w-1 with more possession and more shots. Because the defending formula 3n(DC)-2(DML/DMR) can protect the goal from all most attacking formula. BUT, i saw my midfielder can't defense long shots from opponent's MCs(maybe with red arrows). Even 1 penalty happen when opponent's MC go straight to the box and my DMC fouled. So I'll change and just wait for some results.