Andrew, if your consistency is improving, you are moving in the right direction! Two things I see: first, your elbow is almost there...but still just a bit high. Not that big a deal and you can easily shoot great without the perfect elbow...just another one of those ethereal concepts of "the perfect form". Second, if you stop/start your vids quickly and watch the position of your head as you draw, you will see you are moving your head back right as you are approaching anchor (especially in the second movie). Not sure if you are trying to stretch anchor or what, almost looks like that. In my experience, the top of the "t" should stay rigid for best performance.
The last shot on the first video looks like your hand is very relaxed after release, watch and compare it to the other shots of the first vid. It looks like you are closing up then consciously opening it on the shot right before the last. That whole "relaxed release" concept really helps with back tension...you can't help but keep following through if the thing holding the string is simply gone.
Keep shooting and honing your form, you will work out the kinks and it will feel smooth with practiced repetition.