Okay, I feel like this may have been looked into, since other ppl I talk about seem to be familiar with the slight packet-loss on these servers. There's really tho no acceptable amount of it. While it's been many years since I have hosted servers, I do vaguely remember this being alleviated by playing with a couple rate settings:
net_splitrate i think i set to 2
and net_splitpacket_maxrate to something really high, like 100k
Sorry if this has already been explored, but if it can help, id be so happy :3
But yeah, it can make for some funny and annoying glitches. Like players stuck in taunt poses hehe. Also tho can make hit reg inconsistent, stickies not registering detonation.