Nice Jump, i think i saw you on the dyestat page for that jump?
anyway. Maybe finish your take off a little better by moving your step back 6 inches, to give your self more time to get your trail leg back before you swing. Then you will swing faster and maybe carry you to inversion better.
Do you look at the bar a lot? It kind of seems like you might be focused on the bar, and if you are fully inverted you lose sight of the bar for a slight second.
Ring, rope, and bar bubkas should help too..
Your hands look like they are in the right spot, but thats usually what stops vaulters from going totally inverted, they row their hands out. Make sure you keep your hands over your head when you swing.
Thats all i got
. Good jumping, congrats on the win, are you going to Nike?