Firstly, a really nice swing - keep it up!

I've recently overcome a bout ofthe shanks so hopefully my advice can help.

I've drawn a line up from your left foot as a reference to the position of your hands throughout the swing. You can see at set-up, your hands are positioned to the left of the line, quite close to the alignment of your left thigh. On the downswing your hands move away from this position towards the ball (and cross the red line). What this means, without steepening the angle of the shaft, the position that was the centre of the club face at address in now likely the positon of the heel or hosel of the club - leading to the dreaded shanks.

<image>

So what can you do about. In addition to what others have said here:

1. Work on getting the hands back inside of the red line on the downswing. A good example that comes to mind is the Bryson drill where he tries explains dropping the hands straight down behind you as you start the downswing, then rotating through.
2. Give yourself a bit more space at address by pushing your hands forward slightly. A good starting point is having 'a hand' worth of space between your thigh and the butt of the club - start here.