One of the most common problems of the over the top move actually starts at the start of the downswing. You might set up correctly, get the club back correctly but at the start of the downswing what you will do is you will turn before you shift. This turning around the right leg might be called spinning out, and the club goes outside before it goes down to the ball, thereby producing a swing path to the left and a pull. What you would like to have happen is that at the top of the backswing you feel like your weight goes from the right heel to your left toe before you start your turn. This little bit of a shift from heel to toe drops the club inside the target line, then you rotate, and the club goes down the target line eliminating that pull. A good drill to help you do that is to set up in your normal set up position, then move your left foot forward and your right foot back until your right foot is behind your left foot. Then practice hitting shots with an a middle iron with the ball on a tee, feeling like your weight goes to your right heel on the backswing and your left toe on the downswing, so that you go heel-to-toe. That way you will change the path of your swing more to the right, eliminating that pull shot.