Yep the sabres should be a little longer. Possibly a bit thinner too, however I think what makes them thicker than they really are is the lighting levels. The colours and brightness of the light sabres do not blend in with the movie footage and so have that 'stuck on' look to them.
I think, if we look back at return of the Jedi, you have the lightsabres justy about right.

being light sources themsevles though, they will need to cast light onto the scene - not easy.
the running around the wall didn't work for me though. You did it the only way possible really (without wires) but sadly it looked to em just like what it was.
Jedi jumps - pretty cool

Again done in the most cost effective way. Practise makes this perfect. Very hard to get just right but some very good attempts. The jumping onto the shoulders gives the game away more than most though