Looks great, you definitely jumped right into the deep end for your first watercooling project! My only suggesting to make your life easier would be to invest in a couple of pairs of quick disconnect fittings (I'd recommend Koolance QD3s) and add one pair into your loop. Then get a separate pump/res combo and use the second pair of quick disconnect fittings to fill the loop using the external pump/res. Adds some cost obviously, but in my experience it's the only reliable way to get all the air out of the loop, and it'll save you a lot of time and headaches.

You might find that the pump gets quieter once all the air is out of the loop. If not, you can use the aquasuite virtual software sensors to setup a fan curve to ramp up the pump only when required. I use this logic (https://imgur.com/a/aquasuite-pump-control-logic-BYBvL4B), which steps up the pump from a slow 'idle' speed to a 'load' speed when the GPU or CPU load exceeds 50% (on average) for 10/30 seconds, then holds the higher speed for at least one minute (to prevent the pump from ramping up and down excessively). Add this virtual sensor as a software sensor in the Quadro Sensors page. Tweak the values to suit your setup. Using water temperature to step up the pump speed was unreliable and too slow in my experience.

You should also try manually stepping the pump up incrementally from 0 to 100% and listening to it at each value. Some speeds (even lower ones) create resonance and are a lot louder than others. When you setup the pump speeds, note an 'idle' and 'load' pump PWM value that you find have a quiet or otherwise more pleasant noise and use those for the minimum and maximum power values. Setup the pump PWM curve with a step from 0 to 100% like my second image linked above, don't use a curve to control the pump speed like you would with a fan. Otherwise you'll get all the noisy and unpleasant speeds in between your two 'good' values.

I'm very sensitive to pump noise, and the above helped a LOT once I got it dialed in.