Custom Resolution Utility (CRU)

[S0larSoul]

Hi! Could you please help me with CRU? My setup is the following:
GTX 1066
TCL 50DP600 (4k HDMI 2.0 TV)
10m HDMI Cable (9 GBps)

Since I have such a long cable (I need it to be this long, and I couldn't find any better for halfway reasonable price), it has limited bandwidth - 9 GBps. What I want is to use my TV at 4k@60@YCbCr420, but support other resolutions and refresh rates at 420. It works pretty much perfectly when set up 4k@60@YCbCr420, but I have two major issues, which come down to TV's EDID, specifically combination of resolution, refresh rate and chroma subsampling. First one - when I try to run any other refresh rate other than 60 (23.976 specifically, but 30 and 50 would be nice to have too) I can't set 420, only RGB, 444, 422. Actually, I can't even set 420 for 1080p, no matter refresh rate. On top of that, I have an issue considering limited and full RGB spaces. When 4k@60@YCbCr420 is set, TV for whatever mysterios reason to me, accepts and shows colors as if they were in full RGB instead of limited. BUT when I switch to 422, it shows as it is limited RGB.
Long story short - when TV switches to other than 60Hz refresh rate, it messes up the colors. I could live with "real" limited color space, but if it was actually limited all the time, not only when refresh rate switch occures.
Oh, and on top of that, games don't work on non-native resolutions in fullscreen (scaling is set to be done on GPU), just no signal. My best guess is that is somehow related to the issues above, but I don't know.
Could there be something done with CRU? I've attached exported .bin from my TV to take a look at.