Concerning ZEN: I think a big issue is the ZEN Alliance having the public option clicked. You see, it treats all the companies as one company. So if one of the companies can't afford to be on the ZEN Network, it would treat all companies as if they can't afford from said alliance and were given the boot. Until that one company can get into the position to be able to be on a network, the others can't either. Then compound that any damages that damage one, damage all and it just snowballs until they are shells of themselves.
So I'd really recommend turning that option off. It honestly is more of a detriment than a boon like it says it would be. Just keep it off and treat it as public without it. It'll function much better. You don't have to worry about anyone leaving since you have them listed as permanent members and they'll never have issues with each other as they are listed as sister companies.
Another thing I'd like to point out that isn't too much of a big deal is that Entertainment isn't selected for ZEN alliance for products. This is more a nitpick from me, as there isn't anyone else who is going to be joining ZEN, but as both Comic Book Lucha Libre and Monster Battles are Entertainment based it would make sense for that option to be selected.
The other major problem is that each company will need to own its own network. The game just can't see the network as being owned by the entire group. If you have it owned by the media group ZEN Network, it'll just treat it as traditional channel. If the company doesn't live up to their standard, boot it goes. Even if they are owned. Also even if you deselect the exclusive rights option (which is currently listed as on), it'll just be negotiated to be back on when it is time to renegotiate, so it isn't as simple as doing that either. Or at least what I found when I was working on my mod I told you about.
That's about all I can suggest for you. Sucks, since I know that isn't exactly what you wanted to hear, but that's probably the only solution that will work the way you want it to work currently.