What resolution are you expecting?
Your 2k screen is 2000 x 1200
YouTube is playing 1080p, which is 1920 x 1080.
It's using the highest resolution possible on YouTube. The next step up is 1440p which your screen does not support.
Try 168, failing that try 3368
The time syncs from GPS or the internet. It's a waste of time setting the time manually as it will reset every time the unit restarts.