Low volleys are not a favorite for anyone that I know. There are many factors to consider when hitting volleys off of balls that have dropped below the level of the net. You have to consider the trajectory and speed of the incoming ball as well as your racquet position and angle. You also have to consider your own position in the court and where you want your target area. But there is one tendency many players have that could be corrected.

Many players stoop over the ball by bending at their waist rather than their knees. Bending at the waist not only throws the body out of balance but changes the way we see the ball. For instance, think of how you see the ball when hitting your best volleys. I bet the ball is out in front and probably not to far from eye level. When the ball is low you should try to get down with the ball by bending your knees so that your are as close to that "ideal" position as possible. By bending your knees you will drop your body into a better position from which to volley. By bending at the waist and stooping over the ball, you probably are seeing the top of the ball and the court below in your view while a knee bend helps keep your vision more directly at the ball and toward your target area.

Low volleys can be difficult but using good footwork and a good knee bend can put you in a much better position. Try to focus on a few knee bending low volleys in practice and I'll bet you'll see better contact and placement with your volley.