Set your Max-Flo output pressure between 180 and 200-psi
Set your dwell to 15 chirps and fire one shot over the chronograph. Now increase the dwell and fire a second shot. If the velocity increased, increase the dwell again and fire another shot. Keep doing this until the velocity levels off. Then drop the dwell setting down two to four chirps .This will be your dwell setting at whatever operating pressure you had the marker set to. Now decrease your operating pressure and use it to control your velocity.
Hope that helps