I know you mentioned you're particularly interested in mid/late game things, but I haven't been able to get that far yet. I have about 20 hours in the game, but on an old patch. I put it down for a few months, and when I came back I figured I'd play on the newest possible build. I play on a private server with one friend. Initially I didn't tweak any settings, so I was dealing with the default zombie rates (normal/daily/10%) and populations for this version. HOLY SHIT. We couldn't do anything. And we aren't total noobs here, but there's no let up. Before, if you ran into some zeds, you could at least run away for awhile and lose them in some trees/houses. Now, everywhere you run there are zombies, seemingly more than are already chasing you. We could barely establish a safehouse, as there were too many zombies around any given house for us to hope to kill them using frying pans and the like. I ended up turning the zombies down to low, the respawn to weekly, and setting our spawn point in a house as opposed to random. The density of zombies is much more reasonable now, as they don't blanket the entire map, but there are still quite a few in some places. I feel like this is closer to how it should be. If we progress further I might report back with mid game stuff.