Well. Not sure about your question but it seems odd, I'm not a mechanic guru by any means. But the way that you bend over forward when you throw. I'm not sure if this is bad its just something I noticed. Take a look yourself.
EDIT: It actually doesn't look that bad but someone else can take a look. Oh its hard to tell from the angle but you might not get good momentum becuase it seems you lack some hip/shoulder seperation. I also haven't slowed the video down to look but its just an idea. The videos great I like the extra pitches. But next time try and get the side view also.
Looks very solid. Keep up the good work.
EDIT2: FYI you looked like you have horrible mechanics in the first video you showed without actually throwing the ball. Now they actually seem like they're pretty decent. Of course they could use work but whos don't need work? In the other one it looked like you have never played baseball before and throw like someone just trying to throw the ball. See the differnece it makes with you actually throwing? You look like a ball player.