Actually, it worked. It really did reduce the shimmering a lot. Didn't remove it, but makes it bearable. Thank you very much !
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Usually that Shimmering effect is caused by Nvidia Control Panel setting "Image Sharpening", if it is on, turn it off completely or at least for FFXIV.
It is often set on by Geforce Experiences' optimization. Turning it off might have no effect, if it doesn't fix the shimmer, you could try setting the AA type options to off in the NCP and set the in-game one to on.
Worth a try.