I get occasional judder on my Samsung, although I've only ever seen it when watching Snooker. I've seen it when watching on ITV4 and Eurosport and as my free channels are through Freesat, it's clearly the Samsung Auto Motion Plus that's responsible, especially as it wasn't evident on my old TV.
I've left the Motion Plus on Auto, it's better overall and I can't be bothered turning it off and then tweaking the settings. It's not a big deal for me so I've never looked for any solutions, but it is the TV and nothing to do with the rest of your set up.
We had a Samsung tv and would get judder on a lot of programming - say sports.
If you got it working perfectly on sports then we would find it on films.
Never found any suitable setting on the tv at all.
Get tv replaced in the end.
Looking at other forums (Sky & VM) it does seem to be a common issue with Samsung tvs.