Guys, I just created an account to talk about this problem.
I have a PG35VQ monitor as well as a PG27UQ. The PG35VQ is bought 3 months ago from the physical ROG store way ahead of the availability than any other online retailer.
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First, the "flickering" you guys see is, in fact, ghosting/overshoot made by overdrive.
Check the link about ghosting:
https://www.blurbusters.com/faq/lcd-overdrive-artifacts/
PG35VQ is certified as flicker-free by TÜV Rheinland, the monitor doesn't flicker by this standard. So you cannot persuade ASUS to address the flicker problem that is actually ghosting.
Why the flickering is more visible is due to the VA panel itself. To maintain a clear image, the overdrive is more intense and has a higher voltage.
This effect is worsened in HDR because of FALD's effect due to high brightness, overdrie will trigger the FALD and make it more visible.
I've talked about this on many occasions that VA panel is a poor choice for PG35VQ at such specs but AU Optronics couldn't produce any high refresh rate IPS panel at that time. So we get the PG35VQ. It will be PG35UQ IPS in 2 years.
All the games in monitor industries right now are bet on the panel availability.
Back to the ghosting/overshoot problem, the VA panel is more visible and you can not do anything about it.
RMA or return or receive a second-hand is all the same if you are over panic about this issue.
The only thing that can assure you guys is the E-sport 240Hz monitor have the same ghosting effect if the overdrive is set to extreme. It is less visible as both the resolution, DPI and brightness are lower than PG35VQ. Ghosting is sharper on PG35VQ. I game from 240Hz and still using it, this is a normal technology problem.
Yet this is the only kind of monitor with 1000nits, 200Hz on the planet and the ghosting issue doesn't hurt the gaming performance because you can see more clearly in motion.
Now I'm rocking 200+fps BF4 and BF5 on this monitor with a 21:9 ratio. No other monitors can reach this satisfaction except Zowie for absolute low lag experience.