Unfortunately there aren't different logging levels for Secure Access. You could try using procmon logging instead. You could create a procmon filter that only displays client connection information, and set the option that tells procmon to drop filtered events. The only downside is when procmon runs for a few days it can hog up all available memory, so you may need to restart procmon once per day. The only other downside is that logging (either procmon or file based) reduces performance but that doesn’t seem to be an issue for you since you have file based logging on anyway.
We run our Secure Access with logging turned on for security reasons. Version 8.5's logging is creating extremely larger log files as compared to 8.0.1 and filling the disk in a short period of time.Is there a setting or registry or file to edit to change the amount of logging. For security reasons we only need client connection information.  Thanks, -Greg PolenTexas A&M University
Secure Access "Gateway" logging level