This is my first post on fm-base forum, so I wanted say hello o/,
Now, back to topic. I created quite similar tactic in FM 2011 demo and it worked great! Everybody on a pitch were doing what I wanted from them. Play was attractive and effective.
Unfortunately when I wanted to use it in full version of game something wasn't working. I didn't liked FM2010 for new version of tactics that came with creator, too late I figured out I still can play old-school version. I think there is a problem with match engine in 2k10 and 11, that it is one big lottery... But ****, in demo it was working. So maybe it's not so bad as I thought.
Hoped I'll find answer in your tactic. Well. When i checked it, my Liverpool lost with Norwich in Carling Cup 3rd round. I give up.