Its a player issue OR a renderer issue OR a GPU Setup issue OR a tv issue. I can't be more specific than that based on the information you've provided.
I'd suggest following my setup guide, turn all of those enhancements off incl dynamic range
Well - it was set over the lav settings as I have used your guide for some time now (0-255) and turned of all teh features from AMD - but it seesm as with OLED it does not work like with LCD - no idea why. But I guess it's as with everyting a personal experiance. Using the AMD settings now for me it seems to be much better.
What is also not clear to me - with teh whole Contrast and light setup - if it is suggested to turn it down so you see the flicker starting with 17 - doesn't this mean that in return using 0-255 is working against it (if the movie was encoed OK and there should be nothing below 17 ...)
I think from memory (and a may be wrong) the 0-255 and 16-235 settings in LAV don't make much difference unless you disable YUV... From memorry the 0-255 vs 16-235 only makes a difference for rgb, and since movies are all YUV, that setting will only make a difference if you force LAV to convert everything to RGB. Usually the renderer handles the colorspace conversion.