My ordeal is over.
Launch day blue 1TB 17PM GVC screen horrible green shift.
A week later, got another one. GH3 screen. Green shift is better, it happens at steeper angles than the GVC, like 5-10 degrees more rotation before bottom of screen turns forest green. For example, when tilted to same angle, the bottom 1/3rd of the GVC screen has severely shifted green, whereas only the bottom 1/5th of the GH3 has shifted. The top also dimmed less when top of screen is tilted away. However, screen was a little dingy compared to GVC. I was going to keep it anyway.
Went to a different Apple Store from where I got the first two phones to return the GVC phone. Checked out all the display models they had. All except one of the Pro models looked good, no green shift, just typical dimming or neutral gray shift when screen when is tilted, like my 16PM GH3 screen. All the Airs looked bad. All except just one PM looked varying degrees of bad, I was suprised to find a unicorn.
When talking to the employee about why I was returning, he said I could exchange it no problem and return it if it still looks green. So I went ahead and got a third PM.
Got home, turned it on. Instantly knew it was good. No green shift whatsoever. Setting it up now.
No idea which screen is it, but it's absoultely perfect and a keeper. I'll edit post if I run the diagnostics to find out.
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Left is 17PM GH3. Right is new 17PM, haven't looked up code yet. Imagine my first GVC which I already returned, the green would be half way up the screen at this same angle. Horrible.