Try switching the TV to PC Mode with 0 sharpness. Switch off GPU and TV scaling. What timing standards did you select in CRU and Nvidia CC? Try rebooting after adding 60Hz reso to TV EDID with CRU (leave Manual timings unchanged), then add same reso in Nvidia CC. Can you select YCbCr 4:4:4 at that?
Read also Club3D HDMI2.0 Adapter thread.
Edited by zamaracrillio - 1/27/16 at 5:19pm