As far as I know, there is no way to attach files directly here.
If you don't have a dead-zone in the center of the paddle where the ball bounces naturally, then you don't need this action - "set a to a>1 ? a-1 : (a<-1 ? a+1 : 0)", you can remove it.
To change how the ball bounces off when hitting different parts of the paddle you can experiment with these values:
Set a to clamp(a/2, -45, 45)