Yes, I do lag, such as when I'm close to someone and shooting, it lags me. I've asked a few people in my server to be guinea pigs and see if a random player has the issue, and they do as well. So it's something probably with amx_super.
And finally, when I disable amx_super, and turn the old version back on, it works fine with no lag at all. I'm surprised the server stayed full for as long as it did with that going on.