On my backswing, (I use a semi-western forehand grip), what are the general rules in regards to generating spin/power. It seems as though when I flatten out my backswing (racquet face parallel with the ground), I hit more topsin, which happens to land shorter, is somewhat flat in trajectory, and the shot I mishit the most. When I open the face of my racquet more on my backswing, I still hit some topspin, however it just overall feels weaker, but more of a consistent shot. Do my interpretations correlate to other's experiences, and if so, does anyone have any recommendations on what type of backswing to use on different shots? Thanks........