After a certain patch, the AI will change the production level. To manually do it you have to add a second player to game, make owner, change levels, leave game, assign ai ceo again.
I'm fairly new but for me its been easier to use my own broadcaster. Especially if you plan to have more than 1. I have 2 child companies in the SouthEast, 1 child company in Japan, and recently opened a child company in India. My own commercial broadcaster is Very Big in North America, Japan, and India and Big everywhere else. The only thing I don't broadcast on my own network is the Parent company Events, i put those on PPV network with Huge in north america.