I get fixated because I like finding fixes. Did it for many years.
I don't know why anyone would use steam instead of direct. It's kind of just a middleman.
DX12 is on all new Windows systems now. I have DX12. But the DX11 exe file was made with DX11 info. It will run on a newer DX version, but limited to what it was made for. DX11 is probably not fully utilizing DX12 systems.
A big question now, that I don't seem to get answers for is,... do people using VR see the same thing we see?
The reason I'm looking into nvidia settings is because there may be a workaround, not so much a "fix". But there is infinite combos that makes it hard to find when ya gotta fly 30 min for each change to test it. I do know, some setting I makes minimizes the issue from 2 sec, to 250ms or less. So I know it's there.
The workaround now is using DX9, until it's discovered.
Last I looked there were only like 24 steam users.