I'd write up my experience of setting up multi-computers, but it would be pretty boring. I followed the instructions and it worked first time. Took about an hour all up from go to playing. BUT, I do that kind of stuff every day, so I could accurately guess if there was something missing.

Not sure why broadcasting wont work for you (or presumably any keystrokes send to the game as they all use the same mechanism). That sounds very muchly like something in your profile is not quite right. That usually requires a sharing of your config to figure out.