I'm wondering if you have the technology to do this: draw a line from the buttcap of the racquet to the 12oclock position of the hoop, and trace that line, creating a 3-D image. (I think you've already done this with just the hand?) I think this would help me visualize pro strokes better. To add icing to the cake, maybe make it a darker colour when the racquet is faster? Just a little suggestion.