[Dafni]

Interesting vid. Nice idea, made me smile!

I think you have some binding there. If I do the same with mine, they roll better!
I always keep an eye on my drive line. Your best bet is to test every area individually with your fingers. Sometimes the diffs need a bit of break-in (you could do this with a drill)
In your case it might even be only one single bearing somewhere. Knuckle-bearings like to die from time to time.

Good Luck!