Thanks for the suggestions thus far.
When going from the Trophy Pose to the racket drop, is it good advice to feel gravity taking your racquet down (implying loose grip and loose arm)?
Further, it is well established that pro's keep their racket "edge on" until just before making contact with the ball (pronating at the very last "second"). Are young kids able to replicate this? Is it ever OK for them to pronate a little bit sooner?