Can you link me to the copy you are looking at? The pages don't line up with the hard copy I have.
Does the Voltage setting just act as a limiter like the LNA adapters, just for PWM fans?
Also, the exhaust pwm is fairly close to the pull fan on the cooler. could the airflow from the noctua fan @1300 be causing the cougar to be running 300rpm faster? All 3 of the cougar fans are set to 35% in speedfan.