i will also replace it with the noctua nf-a8 pwm
do you see any potential for improvement in performance?
You won't regret the fan change. Even less noise, and less vibration as the Noctua fans have anti-vibration pads on each corner.
To get more performance, you could turn the voltage knob clockwise, giving it more voltage. The hashrate should increase.
Here's pictures of the knob on mine (before/stock, and after) :
https://imgur.com/a/F1V84qf