I find that my teams results don't improve when I am watching. If anything one or two of them have been better when I didn't watch.
I have kept an eye on it and it doesn't matter if I am watching a game where I make no changes or not.
The possession boosts don't seem to count for much, even if teams only have 20% possessin they still make as many chances. I've said it befor that this game seems to be more about random variables then quality management.