I see your stop...and that's not really a problem...I know a couple of guys that 3/4 draw from the get go, then finish the draw after a pause....both of them are good shots and heck on game.
What I do see is inconsistancy in your anchor and release. I think that will come with time....but you really need to come to full draw, and do it every time. By not getting full extention, you are cheating yourself out of power and accuracy, as your draw length is shortened and you don't have proper back tension. Also, by not getting to a solid anchor, your consistancy will not be solid either.
Some of your short drawing is coming from you leaning forward, curving your spine, and poking your head forward. All those move your anchor forward, shortening your draw length.
I think the comments above will be rather easy to fix, but its going to take more than just a couple of sessions....you gotta get it right, and burn it in.
If you can, set up the target at shoulder level and film again, and make sure you get your bowhand and your drawing elbow in the frame, and post it here.
I thin