Agreed. Real nice delivery. I totally agree with #1, even in the windup. Exaggerate loading up on the back leg a little more. He has the explosion, I just think he is having to play catch up with his arm a bit when his lower half gets going a little to fast down the mound.
The only other thing I saw was his glove arm tucking to his chest pretty early in the delivery. I think a little more front arm extension then the cue to drive his chest to the mitt rather than pull the mitt to the chest would get him a little more extended and direct to the plate.
Besides that, enviable mechanics. Strong kid with a good arm.