Hitting that far behind it is usually caused by excessive sway back and nothing through. You may not know what to look for in a video, but if you post it, I gaurentee I will.

The keys to work on are to practice with your feet close together. This will elimiate any sway. If you still hit behind it, you are now have something going on in your hands releasing wayyyyy to early...not likely. My bet is on the sway. Once you get the stots consistant with the feet close together, work them apart slightly. If you start to hit behind again, go back to the feet together again.

For about a season, I did nothing but practice with my feet together. Did wonders for my balance and consistancy. I still start all my drills (1 or 2 shots) that way, just to remind me again how important it is to stay balanced.