You can set delays for throttle up and throttle down using the fan expert tool. Increase throttle down timer on exhaust fans first. That way you let the system vent hot air from the system a while after CPU temps go down. Play around with the settings.
I know the AI suite is a clumsy set of software, but it has some good functions. You can for instance have fan profiles. Have one for quiet operation with low base RPMs, and one for performance with higher base RPMS for more predicable noise generation.