Guys I think I've made a breakthrough for me!
I've had my C6P for over a year now and I think I've finally found the settings that looks the best for me...at least watching 4k blurays through my Xbox One.
Watching Spider-Man Homecoming, in particular, the scene where Spider-Man is chasing the bad guys in the white van through town, with TM set to DJ2,DB5 I see NO ARTIFACTS and very little judder. This is from a seating position of about 4 feet also.
The judder on this set without TM turned on to some degree is bearable and what I've had this TV set at most often but during long panning shots or quick moving scenes it drives me crazy. Even with watching high quality 4k movies it's hard to even tell what is going on during intense actions scenes because to me, u lose so much clarity. With these settings for me everything looked fantastic! Best I've seen since I got this set.
I must add also, that I am probably more turned off by artifacts then judder. That's why I have messed with these settings so much. Just about anything I've found where judder was under control the artifacts became too much to bear. For some reason, the combination of DJ2, DB5 is almost a perfect sweet spot. At least for me.