There needs to be a way to move the box without having the ball move, to recenter it, otherwise you occasionally end up without enough room to move the box.
Maybe R to reset and Space to recentre?
I felt the same way, until I realized you can physically throw the ball towards the middle instead. I call it "Manual centering".
I mean without the ball moving in relation to the box. xD
in that case I disagree :D I love how the position of the ball in relation to the box is a part of the difficulty! :D