There is no perfect height to make your throws.
The higher you throw the balls, the longer it will take for
them to come down, so you have more time to get everything
The lower you throw the balls, the more likely they are to
be vaguely accurate, and to land where you want them, meaning
you have to spend less time correcting yourself, and hence,
you have more time to get everything right ....
Somewhere, between the two extremes, is the perfect height
Have fun finding it, but for beginners, it's usually just
over head height.
The important point is that all throws must be to the same