You are trying to get a lean that balances the bar over mid foot. This will be slightly different for everyone based on body proportions. The lean you have in the last 2 reps is the best in this regard. The rest of your form looks pretty good as well. Just cut a bit of the depth off so you are just below parallel and be careful when you take your breaths to not puff up your chest (as this can over arch your lower back).