Finish a cutback first time with a clean, driven contact. Time the run onto the moving ball, get the plant foot right, and strike through it low and on target without taking a touch.
A server drives a low cutback across the top of the box and the striker runs on to hit it first time into the corner, keeper in goal. Time the run to meet the ball in stride, plant the standing foot, and strike through the moving ball with the laces to keep it low. Serve from both sides and vary the pace of the cutback.
A ball moving across you is struck differently from one arriving at you, and the difference is almost entirely in the plant foot. Facing an incoming ball, the standing foot goes down beside a target that is coming to a predictable spot. On a cutback the ball is travelling laterally, so the plant foot has to be placed where the ball is going to be, not where it is. Get that wrong by a few inches and the strike is behind the ball, which drags it wide of the near post.
That is why the shot pulled wide is the signature miss on cutbacks, and why telling a player to keep his head down does not fix it. His head was down. His foot was late.
The adjustment is small steps into position rather than one big stride. Arriving with the feet already set and then shifting slightly with the ball is what produces a clean contact, whereas a long final stride locks the body into a position the ball has already passed.
Striking first time is the point, because the cutback exists to beat a defence that is recovering. A touch to control is one second, and one second is a blocked shot or a keeper who has reset.
Contact through the middle with the laces keeps it low, and low matters more here than anywhere: the shot is taken from twelve to eighteen yards with bodies between the striker and the goal, and a rising shot hits a defender or clears the bar.
Save it to your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block. Or start from a blank pitch and build your own.