Nice job. Though I must say you must have some kind of super hearing because I have two NeoHE 430s and both are silent.
Maybe you had a bad fan?
Maybe you just haven't heard it yet. It's a blessing.
(I don't mean that it's loud, but it can be heard, maybe bad fan batch...)
I also believe that the NeoHE can be improved upon, particular that Adda fan. It's good, but not the best, and it's ball-bearing.
And required air flow - in the review it does 20dbA up to 21dbA @ 150W, that's like a low power CPU with mid-range gfx (or more than that), @ full load.
Oh well, anyway, I just chunked a Panaflo "L" in mine and forgot about it. Warranty destroyed, but hey it's a Seasonic and it's not my main com.
Gonna get a Yate Loon into my S12 right after warranty is gone. That's for my main rig.