The contact spot is irrelevant at the time of execution, if you take your aiming a step further. Start with the ghost ball, and from this determine the line of your stick. This line and the line to the pocket form an angle. This angle is easily determined after some practice. Soon you won't even use the ghost ball.
Keep your stick, while stroking, on the line, without violating the cue ball, and the ball goes in.
The angle can always be seen.
Keep your stick, while stroking, on the line, without violating the cue ball, and the ball goes in.
The angle can always be seen.