There are lots of places where you can't get to without a double jump, so the humans just sit there and win if zombies can't double jump.
I made zombies do 190 because on other servers its insta-kill in 1 hit anyway. A medic can turn many of those classes into 2 hit kills with overheal so it gives an incentive to play medic.
I increased the knockback because that's the only way to give humans a fair chance now that zombies have almost everything unlocked. Pyros can do airblast, I also increased their ammo regeneration to 10 per second so you can airblast every 5 seconds now.