Can you learn the Disarm or Knockdown feats at lv56+ from a pandect and still get the Greater version of them that usually fighters get at lv41? If you can, there might be room to squeesh Whirlwind Attack into the build. If you cant, then i see no room for improvement. Saves at 2xdemi with +14gear are 67/61/65, very good. I like the build and dont see much to be changed.