No idea Bubba, I don't have much experience yet to offer specific formation advice but since I use 4-5-1V and slight variants of it a lot I find that I prefer a blue arrow on DMC when up against a 'through the middle' formation, particularly if I go for 3 narrow defenders.

Others have different experiences but I have had inconsistent results using counterattacking in V formations. I prefer to pull the AMs back into a flat 4 or 5 in the midfield (depending on whether I need a DMC), with the ML/MR motivated forward (red arrow). In my mind I justify this with the intention of having fast breaking midfielders from my own half. (And I always use defensive with counterattacking because I tell myself this maximises the counterattacking opportunities).

Now just wait for someone to give sensible advice.