Be careful reducing the max...it might not be able to start/idle when it's cold out and it's sat overnight.
The minimum idle airflow table is the minimum throttle angle (after some math to translate it to an angle from that airflow) with an RPM axis...the max it the max.
That's why you see cars idling with extremely low spark advance if they have too much airflow in the minimum table...the PCM can't close the throttle enough because of the minimum, so it has to pull spark to bring the RPM down.