Yes, not happy with my Quiet-1 4000. As I used it.
Generally nice pump IF you have almost no head back pressure. High-ish flow, low power, quiet.
But under pressure, they kinda stink. Get pretty noisy, and flow drops off very quickly.
I opened it up and it is pretty obvious why.
They have a tiny little impeller, running at a fairly high speed.
I switched to Pan-World 50PX-X, but that is a bit overkill for you.
I have used the Pan World 40PX for years as well, and that was great. Might be a bit low for you, but close.
BTW: If you want ultra-low noise, the Poseidon PS-3 is simply amazing.
Mounted on a heavy block, you have to touch it to know it is on. Really phenomenally quiet.
And just about perfect amount of flow for you.
But it is a bit of an energy hog, and quickly pours all that heat into the tank.
(In our climate, not always so bad, since we have heaters on so much anyway)
Want some pumps cheap?
(Q1-4000, or Poseidon PS-3)
(If you are interested, PM me. Union City.)