Tech came out to perform annual AC inspection tech tested torque booster limits amperage on both compressors and outdoor fan motors tested airflow and refrigerant levels. Inspected electrical equipment for corrosion. Both systems have a slight restriction. The second floor has a more significance restriction as well as an overcharged refrigerant. Main floor is working well second floor is struggling sometimes to cool tech found the the airflow was quite high for the second floor around 650 to 700 ft.³ per minute. This caused the temperature splits for the second floor unit to be quite low close to 10 to 11°F. Tech lowered the fan speed bringing the airflow to around 400 to 450 CFM bringing the temperature split closer to 15 to 16°F to inform client and advised trying this fan speed first Otherwise we would have to look at potentially alternate units as a second floor system cannot keep u.