Grand Aire Speed Selection Tap

I have a EHK20AKF all electric Central Air unit. The fan blows ridiculously loud.

I changed the blue wire speed tap to position 1, 2, and 3 (low, med, high) and there is no noticeable difference on the fan speed or volume of noise or pressure. It seems very high output. What should I do?

From manual

D. MINIMUM CFM AND MOTOR SPEED SELECTION
Units with or without electric heaters require a minimum CFM.
Refer to the unit wiring label to ensure that the fan speed
selected is not lower than the minimum fan speed indicated.
NOTE: In low static applications, lower motor speed tap
should be used to reduce possibility of water being blown off
coil.
Fan speed is selected at the motor connector. Units with or
without electric heaters require a minimum CFM. Refer to
the unit wiring label to ensure that the fan speed selected
is not lower than the minimum fan speed indicated.
SPEED TAP SELECTION AT MOTOR CONNECTOR
Tap 1 Low 90 sec off delay
Tap 2 Medium 90 sec off delay
Tap 3 High 90 sec off delay
Tap 4 Electric Heat † 0 sec off delay
Tap 5 Max ‡ 0 sec off delay
† Electric heat airflow is same CFM as Tap 3, but with 0
sec off delay.
‡ For high static applications, see Airflow Performance
Tables for max airflow.