Have played tennis going on on 3 decades but have never been able to hit the American Twist serve. Can someone list 3 or 4 pointers that one should focus on when trying to hit the American Twist? Things such as grip, stance, toss, swing, contact point, etc. I am not too far off from being able to hit this serve myself, but so far cannot get that huge change of direction twist kick of the ball once it bounces. My competitive tennis days are mostly over but would love to pass this weapon down to my kids who are just now picking up the game.