VS. Mode Is Rigged!

Hello, I tried out vs. mode recently and learned quickly that it's rigged! I'm serious, I was the plants and I could instantly tell that the brains spawned twice as fast as the sundrops did, and the zombies are dirt cheap. It only needed 250 brains for a Gargantuar, so why don't I spawn them one-after-another? I had disco zombies on me before I could get a lane of peashooters! Don't get me wrong, this mode was an awesome idea, but the zombies need some serious boundaries here. I suggest:

1. You slow the brain spawners, a lot.
2. You either make the zombies more expensive or give them higher cooldowns.
3. Maybe, just maybe, take out the Gargantuar? I mean, the plants don't even have the Cob Cannon or any other plant upgrade like that, so maybe just balance the scales?

Thank you for listening to my concerns, I would love for vs. mode to be made fair in 1.6.