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Exactly 1 month later, I figured out why my GPU utilization was higher than expected...

It turns out that not using D3D Fullscreen increases both the CPU and the GPU utilization - it was my impression that D3D Fullscreen reduced CPU utilization but increased GPU utilization, not decreased both.

So yes, I can confirm that SVP's downscaling algorithm does in fact use the CPU.  Unfortunately for me, it seems like this downscaling algorithm is actually kind of demanding on the CPU since I have to reduce my SVP profile settings considerably.

Presumably there's no way to use a lighter-weight algorithm, correct?

You never stated whether you tried EVR with D3D Fullscreen or not.

And just to clarify, even on 64bit Windows, 32bit MPC-HC is recommended for SVP because 64bit AviSynth is extremely crash-prone (for reference 64bit MPC-HC works perfectly fine if you don't use AviSynth and therefore SVP).

The video's native frame rate wouldn't happen to be greater than 47fps, would it?

Wait wait wait, decoding, not encoding?

My NVS 3100M (essentially the Quadro version of the 210M) supports hardware h.264 decoding via DXVA2 just fine (tested via the LAVfilters built into MPC-HC).

Are you sure it's not just something borky with your drivers?  Have you tried completely uninstalling the drivers via Display Driver Uninstaller and then re-installing your drivers?

x265 specifically; using other encoders actually give quality worse than libvpx (at least they did a year ago).

However, video is always evolving, so in a year from now this could all change when you factor in the Eve VP9 encoder and the AV1 codec.

Even if you encoded in VP9 YouTube will still re-encode it for their VP9 formats.

Would it be rude of me to ask what the reason is for your desire to use VLC rather than the bundled MPC-HC?

Avidemux (the video editor what I use) should support Huffyuv as it even includes support for encoding to it...

You aren't exactly the target audience...

The issue is probably related to the fact that SVP 4 Free only uses "automatic" settings which can sometimes give sub-par results:
http://www.svp-team.com/forum/viewtopic.php?id=2699

SVP 4 Pro has the manual profile settings that SVP 3.1.7 has but with the extra stuff that SVP 4 Free has (new GUI, support for more media players) as well more control over the video profile selection.

Here's the simple version - the higher your refresh rate, the less important backlight strobing is.  Not only that, but if your monitor doesn't have backlight strobing built-in (sometimes advertized as "240Hz") or if your monitor is not 3D capable, then you don't even need to worry about it at all.

Now technically you could still do manual black-frame insertion, but not only have I never done this myself, but on your display that would result in an effective 72Hz which could very well be too flickery for it to be worth it.

Yes and no.

Yes in that you want to make sure that something like 30fps is not interpolated to 144fps as that's 4.8x - you would get a smoother result with 30fps --to-> 120fps (4x).

No in that 23.976 with 144Hz will still give you 6x as it's within the margin of error therefore resulting in 143.856fps which means it will repeat 1 frame about every 6 seconds.  This is no where near as noticeable as the difference between 30fps --to-> 144fps and 30fps --to-> 120fps.  However, you're still welcome to make a custom resolution of 143.856Hz in order to minimize any dropped frames.

That's because it's using the external madVR presenter for fullscreen.  You can still use the normal MPC-HC controls while still using madVR, but you need to go into madVR's options and set it to use overlay instead.

EDIT: Here's the madVR general rendering settings I personally use for performance reasons, but the only thing you really need to do is uncheck "enable automatic fullscreen exclusive mode":

Here you go: