I'm hardly an expert and hopefully someone with more experience can chime in, but two things came to mind when watching you hang clean. First, your torso is pretty upright when you jump. A hang power clean is about explosive hip extension, so you dont want your hip already in near extension when you jump. The second thing was, why put the weight down and then pick it back up? Its not a big deal, but it seems a waste of energy when doing hang cleans.