Zoo has been my main deck for half of my time playing the game. No, i didn't read your links - I didn't ask for them, so I don't feel obligated to read them. I've read plenty of Zoo guides in the past while I was learning the game.
Zoo CAN'T trade the entire game anymore. That's my point. The minions just aren't strong enough now. You lose too much steam and have to spend more time tapping, which is dangerous in a lot of matchups. There has to be a point where you push face and let the board alone a bit. There's a reason the deck has fallen on the tier list, and will probably continue to fall.
When I play against Zoo, there are only 4-5 minions I am worried about. I find this to be one of the decks I am happy to play against at an equal curve.