Don't mean to be too negative here but am I the only person that see absoloutley no point whatsoever on going on a bowling machine and having it fire down half volleys around off stump to smash as hard as possible?
For me a bowling machine should be used to practice good technique and shots that you are weaker at. What you have video'd will do neither of these.
You are overbalancing with your head and falling over to the off stump meaning you are unbalanced when you hit the ball. Partly because it looks like you're just trying to hit the ball too hard becuase its easy to do so from half volleys.
Set the machine on a good length on or about off stump and test your technique and your eyes out to hit the over pitched ball (the machine through variation will give you one every so often).
Try to keep your back foot movement down slightly as its ending up well outside off stumps and effectively 'squaring you up'. Play side on and this should also help you play much straighter in the V.
Just my own personal thoughts!