as a coach i am interested in a MI that others can benefit from and as detailed A as possible. a MI and A that only benefits them is worthless to me.
I think you're misunderstanding the concept of mental image and awareness. They're individual on a player to player basis, and vary due to physical differences, equipment differences, differences in what kind of playstyle they want to achieve, differences in technical skill etc.
An example of MI + A would be the complete basement beginner who is trying to learn to topspin. He will probably hit the ball with the angle open and close it on the contact. He heard that you need to brush upwards, and he is brushing upwards, but he's not exactly imparting spin onto the ball.
His MI is that you need to brush upwards and his A is that he is brushing upwards, but they're not actually helping him achieve his goal of topspin. He is practicing in a wrong way.
A better MI would be one that lets him understand that he needs to close the angle first, and a better A would be one that lets him understand that he is not actually putting too much spin on the ball because of his blade angle. He will then close the angle and do the cycle again.
The way you CAN apply MI + A to all your students is to formulate an accurate method of "Problem -> Solution" based on common problems. When a coach just tells a student to do something and it works immediately, they've probably identified the student's MI and A accurately, and given them a more fitting combination.