Your stride seemed a little too long for me, and the only reason I say that is because you threw the ball at low 3/4, and looked as if you were throwing uphill. You should shorten up a little bit, and find the place where you can maintain a higher arm angle. You look to me like your trying to get a little too much out of your stride, which could actualy take away from your forward momentum. If you try and stride further than you are able to, your hips and subsequently your shoulers open up early and you lose alot of leverage. If you head to frame 1:31, you can see what I mean. Because your back leg is bent back so far, your hips have had to open early to compensate. This opens up your shoulders to early, and you also find yourself throwing up hill because your back leg has collapsed too much.
Heres what I would reccomend doing(My ametuer oppinion afterall) Go off of a mound, and mark where you land in full windup extension. Now take that mark, and mark somewhere else 4-6 inches behind it. Now shoot for that mark, but focus on keeping your arm angle higher, and staying closed with your upper body. You will probably find you actually throw harder and with more command this way because you are getting more leverage from your hip/shoulder seperation.
Inspiration for you should be a guy like Roy Oswalt. http://blog.kir.com/archives/Roy%20Oswalt27.jpg
See in that picture how he is closed with his upper body despite a fully open lower body? See how his arm is in a good throwing position, which helps him maintain a good downward plane for the ball to travel, despite his low release point? These are things you need to work on, because you both have similar leg drives. The difference is you seem to collapse and fly open.
All in all though, tremendous drive for someone your age, its remarkable you are able to throw strikes with such an explosive lower body action.
(Edit) And also, one more thing. I see you have modeled after Roger Clemens alot, but you have his lean back wrong. He keeps his arm tilted back low, with only a minor upper body lean back. This gives the illusion that he is leaning back alot more than he really is. And I don’t think he does this for leverage, I think its more of a deception thing. Doing this allows his arm to travel on a full plane backwards, but the ball is hidden behind his back thigh, hiding it from the batter.