hi, lots of good things, you are still and have a simple technique.
my thoughts are, you appear to be too far outside leg with your stance. Your outside eye should be over the off stump, it is over middle/leg at the moment.
I suggest you move to a middle stump guard.
having done that you will find the position a bit odd so will need to work on your forward defense again. Try to hold your shape and not let your back foot come through.
I note that you were using a mixture of red and yellow balls, they react differently when they bounce sometimes, so concentrate on one set with one colour at a time!
finally I agree you do seem to plant your front foot slightly, but i would concentrate on your position and defense first and as part of that work. through the front foot issue.
I would be interested to see what Garrattj thinks too, he usually has some good thoughts.