Well I'm not sure if anyone has talked about this but I've noticed that while dashing if you push in the opposite direction and grab you will turn and grab right away. I thought this is especially helpful for Ness since his back throw is so powerful. Using this to point your back throw where the edge is closest will increase effectiveness of it. The sliding of after the grab is greatly decreased. However Ness's head movements still indicate a dashing grab.
Simple version:
1. dash forward.
2. turn around and very quickly grab.
Simple version:
1. dash forward.
2. turn around and very quickly grab.