For your first and second option. This would allow zombies to get better cards easier compared to plants and this would give them an advantage.
You can win most plant quests in adventure mode.
I haven't played as a pl;ant myself on my way from rank 5 to 22, it usually tells me there's a problem with my internet before finding a match.
I do think you're right that thy have to atract more players for zombies as well. But boosting the zombie side with extra packs and rewards would ruin it for the (few) plants.
Your third option might be good.
Fourth, I don't think that's gona happen.
I think all they have to do is just increase the rate of Zombie quests, specially those ones that give 20 gems. Maybe create a few "special event ones" for the lawn of doom that focus more on zombie plays. I think if they make the quest generator lean towards zombie quest for about 60%-70% it will improve things.
I agree with increasing the odds and/or value of zombie quests. A "win 3 multiplayer games with a zombie hero" rewarding 30 gems that recurs with some frequency until the player has done it 5 times, for example.
Of course, they clearly already knew this was a problem from the limited release and did nothing but put a one time message in that wait times were better as a zombie. So they may have their heads stuck in the sand on this one.
I didn't see this problem occur in the limited release. Did it happen at the very start of the limited release? The wait times varied for both plants and zombies for me but I joined in a little later.
