[hdmkv]

No player is perfect. The few repeatable frames w/X10 series are noticeable once you spot them, but not to the point of being annoying. In my case, I rely on Zidoo X9S almost solely for 3D, nVidia Shield (which is terrific w/the recent v7.2.2 update) for most everything else. Also use a cheapo AMLogic box w/CoreELEC, which is actually pretty amazing (HD & 4K HDR, refresh/resolution switching w/ease).

Re: UHD51A calibration, I'm pretty much using built-in presets.