So I bought the same NUC and followed your directions. However, I'm having stuttering issues with 10 bit 4K video. I am stunned. All four cores are maxed out almost as if its not using the hardware to decode. Is there a setting or something I should check? VAAPI is enabled.
edit: I found the modded build and it works great.
Could you please share which modded build it is and a link.