Looks pretty good.
I would agree with dwill that he isn't getting over the front leg as desired,but what does this mean more exactly and what is cause and effect and how might you address it ?
One model that works to organize video analysis is the Nyma-n "buggy whip".
The final unloading to throw is like unflexing (bowing) the handle of the whip to whip the arm "loop".
The handle of the whip is like the spine which must get arched well before the spine can unload/bow("extension" in anatomical terms).
Key point:It is the bowing or unflexing of the well arched/flexed spine which allows the body to get over the front leg.
Problem-if the head goes forward early,you lose the arch/flex,then there can not be enough bow of the handle to get over the front leg.The problem needs to be fixed by a better arching.
But how does the spine get arched,even if you keep the head back longer ? The key is to continue coiling the body as the head stays back so you can feel the arch/coil go all the way up the back and start to turn the shoulders before you let the head go forward much.
To keep coiling while the head is back requires especially good lead/glove arm action.Coiling is thus continued (avoiding front side flying open early) by asymmetric arm action where the lead arm continues to internally rotate (show the palm/grab the money from the catcher/keep the front elbow up/do the swim move-lots of different cues are use to get at this.
I find that you can work on the head and the hips and the weight and the feet and lots of other areas,but if you don't get the lead arm action right,you lose coil and you then lose arch as well as the ability for the stride foot blocking to further accentuate the arch before the final "bow".
As far as timing,Hodge recommends:
"Bring the throwing hand up as the front leg turns over".This synchronizes the upper and lower body well at this point.Then you want to make sure at the same time that you have good glove arm action to maximize coiling as you keep the head back until the shoulders start to turn.