FortiAnalyzer Change Interim log interval for long-live session

Hi everyone, 

I'm having an issue where I'm going over my daily limit for FortiAnalyzer  logs and I'm looking into ways to minimize them without impacting visibility too much. I've already enabled reliable logging and I really don't want to entirely stop taking in interim logs for ongoing sessions. My thinking is that I can increase the interval from the default 2 minutes to make some impact on the amount of logs taken in daily while still providing visibilty

If this is not possible, my next strategy would be to set the compression of logs to happen immediately instead of after the default 7 days with this command: 

config system sql

    set compress-table-min-age <days>

end

However, I would like to know if there would be any impact besides a small delay on alerts or reports, or higher use of VM resources.

Thanks in advance for any assistance.