Just found your post from May 12. I had previously tested this method with same problems you found, but didn’t knew about the RTSS-Sync settings.
So I just configured RTSS with my own FPS limiter value and the RTSS-Sync set to NVIDIA REFLEX.
Unfortunately can’t test right now but as soon as I can I’ll report back if it feel better.
Anyway thanks for your post!
I’m afraid I don’t have a faintest idea as this thread is about fixed-sync monitors and the issues they have with DLSS3 FG. Not to worry though, there are a lot of threads about g-sync on the forums, and I’m quite certain you’ll get the answers you seek.
There is a solution which everybody knows but I am not allowed to post.