This game, however, was short. I didn't even survive day 2. LOL. I think, though, that I've found a great balance in settings.
Max Zombie Spawn
25% Loot rate
Air drop-shipment every 7 days
Zombies always walk
It's extremely fun and challenging. I can still run around and get things done, while still needing to be very cautious going near any buildings or fighting zombies - other zombies can sneak up on you fast. Before you know it, a large group is surrounding you.