" 4-1-3w-1-2-1" you mean 4D- 3MC-1AMC-2ST ?
almost all the threads I read are saying to play with wings (AMR-AML or MR-ML red arrows) against a ND.
My opponents formation is like a diamond style. I am sure that with DMC-MC-2AMC-2ST his orders are "from the middle".
So why I spend a DL and a DR instead of a 3(DC)-2-2-2-1 or 3(dc)-1-2-2-2 more attacking ?

Thanks Niko