CoD has a second dvar that stores your current rotation and would then load the next one from sv_maprotation once it finishes it. All fastApply does is to reset this dvar so its empty and the next map is from your new rotation.
PlayerCountOverrides is used if you want to override the player counts where the map pools are switched for example on a 64 players CoD 4 server.
You are now unbanned now. You just had luck that you tried to join while our DB server was down.
Apparently the shaky weapon sway can also be caused by network issues on the client.
But it definitely looked like you had an external cheat removing weapon sway for you. Sadly T6 does not have demo support yet so I could show you a video…