You're pretty tough on yourself.
Yes, you do lean forward a fair bit and it wouldn't hurt to reduce that slightly - but IMO all you'd need to do to fix that is push your chest up more from the moment the bar is on your back. For me, the cue is pull the bar into my back and pull my chest forward and up. It also helps me keep my upper back tight.
Tightness in the hips can be fixed - and I'd actually recommend pausing in the hole for a couple of seconds to do this. It'll also help you get a feel for staying tight at the bottom and staying in position.
Definitely don't worry too much about empty bar form. Stick some weight on and see what happens.
Also, to stay tight don't drop so fast. Like Reed said, screw the floor (I think of pushing it apart with the outsides of my feet), push your knees out (you should feel tension in your quads the moment you do this) and pull your butt down into the hole keeping all that tension while keeping your chest up. When you hit depth, lead with your chest and push your hips forward and really open up your knees while keeping on screwing/spreading the floor.