Hi there. Well the same here. 3DC when there are no wings. The DMC when the opponent goes with an AMC but I'm always play with at least one DMC (much times I play with 2 cause they are really good) because of the long pass of the opponent, the DMC is the key to stop the long pass of the teams who play defensive and counter. Regarding the 4 5 1 V I used it from time to time, but I feel my players perform better with other formations
Regards