Just ordered one of these, after breaking HX900. It was too head heavy and stiff for me to use properly. Anyone know how this racket compares to HX900, in terms of ease of use? Is it the same head heaviness and stiffness? More? Less? Also, I was looking around for a racket matrix that showed both HX900 and HX800. Anyone have one? I've looked through this thread, and I don't think I saw anything.