1st to teach you all one unwrietten rule about counter formations:
You don't need DL and DR if opponent doesn't have wings in mildfield!
Counter formations are good but aren't perfect, they could be improved because there are some good CF that aren't written. For example 3n61 with DMC, and ML/R or AML/R is counter formation for almost all 4-narrow formations.
I suggest you to use 3n-1-5-1, focus gameplay through flanks, red arrows on ML and MR, mixed passing, zonal marking. You can use offside trap too, it is even more useful if oppo is weaker and you can attack him easly. Don't force counter attacks!