Gonna get back to you on this as soon as I can; I have experienced some significant differences compared to you.I never had issues with motion handling with the nu8000 but here is just on a better level. On very fast motion i would have some jagged edges, on very high frequency movement on the nu, it was the first thing that struck me how this tv preserves edges even in high frequency motion. Yes it is set to 3 by default.
As for hdr, back in the nu owners thread discussions over discussions on this issue of hdr and light bleed. Absolutely nothing here. Literally i would say the biggest improvement is the faled. I am in pitch black conditions and there is no light bleed whatsoever. In the nu due to it being edge lit especially with no bias lighting you could just tell where the leds were.
And i am talking about films that stress tvs with black bars. Matrix 4k, Alien 4k, Blade Runner 4k. Games like Gears that also stress it, Gears 4,5. I would say the faled is the single best improvement. And the hdr is more impactfull due to it. In sdr i always have the backlight at 25-30. If it's pitch black in hdr content then you can imagine it's the same in sdr. I never had an issue with the nu. It was fantastic. But only when i got this faled one i understood what i was missing. Game mode is hit or miss, but i remember you were a film buff mainly.