I have played COD4 for many, many hours since it first came out and have encountered lots of cheats in the game.
As the number of servers die off, (it used to be over 1000) then the hackers become more prolific as they chase away the good honest players in the game.
This condensation of servers and hence increase in percentage in hackers makes it very important that Admins are prolific in the few servers that are left.
I have played in lots of servers, am an Admin in our clan (STARS), was an honorary admin for bBF before it folded last month and enjoy playing on your sc server but there is rarely any admins on line when I play on it.
To be honest your server is becoming a magnet for cheats due to lack of Admins.
I hope that your server does not fold like bBF due to players leaving because of the hackers. The number of good servers is already in decline.
Maybe you can consider using the same honorary admin system that bBF used to keep their servers clean.
Back to the other point, Wortex is a known wallhacker. I was playing S*8 yesterday, specced him for the clan and he was duly booted. He is now playing on your servers.
Just my pennies worth,
Ron