Fair enough, still don't understand why quote me.
Unfortunately, I can't help with LUA, I wish I could, and seems nobody can for a long time. (To find something that handles with damage given/received).
Anyway, my OPINION not INFO for a temporary workaround for the issue of OP, not alone it seems, on THAT server should be:
g_shuffle_rating 2
g_killRating 0
g_playerRating 0
Even though I know you're not too keen to change server settings. I believe it worth a shot.