Zombie damage should be greatly increased imo. My typical approach to loot a town is to run to all loot spots and lose zeds in buildings/forest, sneaking is a waste of time. They often manage to hit me 2 or 3 times, but the damage is so insignificant at best I need a bandage and 1 canned food to fix it. Increasing damage would really make me be careful again and avoid detection at all costs. Another solution might be to allow zeds to run indoors. One way or another they should be made harder. Maybe make military zeds take more damage before they drop, because they have BP vests? It would be cool if you needed to group with other players to loot heli sites or military barracks to have a higher chance of success.