Wow, this is weird coming back after all this time to to talk about a subject that i hate but if you want to make it work here is what needs to happen.
For starters, KFO mode needs to be a thing and KFO needs to be the backdrop of a vs game. From what i have seen it is far to easy to just sit in one place that is hard for the zeds to get to or infinitely kite around the map with no real rhyme or reason for the survivors to move from a safe spot. Lets face it, i kited with a level 15 medic on vs many times before and didn't even break a sweat. There needs to be an objective, a thing to defend or an object for the survivors to get the zeds off of in order to make this mode even have any chance of working. After years of playing L4D 1 and 2 vs most of the times where survivors are taken down is either transitioning between areas or trying to complete an objective.
On top of that if an objective just required camping you saw a massive drop in survivor injury even from a middling team. Without a specialized zombie like a spitter survivors could closet camp with little to no effort. Another example and reason something like Dead by Daylight works is because survivors need to also move around and can't just hide in one spot all game long. If you could just hide or kite with no objective to worry about then you might as well not bother playing if you are the killer. This is also partly the opposite problem that Evolve suffered back in the day before their reboot, some monsters moved so fast and needed so little time to sit in one spot that more often than not they would not even need to worry about being attacked by hunters.
Second, something needs to be done to normalize the levels. You need to either have a set max or min level that you can play it while doing survival vs mode. More often than not it seems that you will get really low level players (0-10) who get mopped and can't do anything besides die where higher level (20-25) can pretty much solo most zeds they come across. It seems like the 15-20 range is what should be aimed for to discount some of the more OP bonuses you get from zed time going off (like nuke or the zerker super speed hour).
Third, less zed armor, faster respawn, more zeds. Even taking kiting into account it seems that some zeds really are to dam tough, especially when you take into account that a player zed can zig zag and come from different directions that a ai zed can't. On top of that it seems like the ai hordes don't currently help much and apart from bullet sponge bloats and gorefasts a player will have a lot of ammo left over. There needs to be a merging somewhat where you have less toughness on the player zeds, a faster spawn time to compensate for that and more zeds overall to make teams pick different perk layouts as well as give zeds a better meat shield to use instead of just face tanking shot after shot.
That is my 2 cents on the issue but also i would suggest that if you can't commit that much work to it then just drop it. May seem rather cynical and a ****ty thing to say but if it's going to become somewhat of a timesink that doesn't seem like it's going to work out in the long run then stop putting work into it and focus on the game's stronger pve modes.
