ATP500 Log Settings

For a temporary period of time, I am interested in monitoring who's logged in, and what changes they may have performed. I had to disable a lot in the log settings as the log fills up in a matter of 2-3 minutes due to the constant hack attempts from all over the globe. As you can see below, I have everything in the "Authenticate" category checked, which shows me who's logged in and when, and I have selected a few items under the "System" category" in hope it would log configuration changes, but it doesn't.

What should I enable to show those changes?

Thanks in advance.