Good discussion~
Normally I will set "focus play on the left flank" to drag DM more close to the left flank thus providing more cover.
By the way, how do you feel about "focus play" TI? Years ago "focus play" in football manager will increase personal mentality in focus area. But in recent versions, there's no such changes, which makes me confused of how it works nowadays.
According to the game tutorial: "Focus play down the left flank encourages central midfielders to move closer to the left flank so passes can be focused in that area. This helps create overloads down that side of the pitch and can be used to draw more opposition players to that side of the pitch"
But without this TI, my midfielders will still move to the side with ball for support. To me the side with more support duties will form a natural overload regardless of "Focus play" TI.