I have almost your same exact build, except for the GPU which is an Asus Strix 2080ti.
I wanted to ask: have you also noticed how the top NF-A14 case fan is always the one to make the most noise, even at low RPM?
If so, have you managed to set CAM's fan curves in a way that this doesn't happen or figured out why this happens?
For example, the same fan(s) set on the front with the radiator, doesn't nearly produce as much noise as the top one, at the same speeds.
What are your idle / under load temps?
Why the EVGA XC? The normal one (the thicker one, ~2.5 slot GPU) doesn't fit?
Where did you place the second 140mm fan, on the top? Could you take a picture of that?, I have intention of doing that and I'd like to see it how you placed it before. Thanks!