Custom Resolution Utility (CRU)

[xnor]

I'm having some issues with my main monitor going black and the desktop on my other monitor freezing, and I don't know why.

So my setup is a 40-144 Hz Freesync monitor as main, and an additional fixed 60 Hz monitor. GPU is a 2070.

Now since some games insist on putting my (main) monitor into a fixed 60 Hz refresh, I though: why not just remove all the sub-144 Hz modes?
And this did work before, but when I try it now and restart/reboot I just get a black screen.

The main detailed resolution of the main monitor is 2560x1440 at 60 Hz.
The CTA-861 extension block has same 2560x1440 for 144, 120, 100 and 60 Hz.

So I just edited the main detailed resolution to the same values as the 144 Hz one in the extension block and removed the 120, 100 and 60 Hz extension ones.

There are also 1920x1080 at 144 Hz and 60 Hz extension resolutions, I left those untouched.
I've also left the other monitor completely untouched.

Is there any reason why this should not work? Did the NVidia driver maybe break this in recent updates?

edit: Windows desktop resolution / monitor refresh rate are of course set to 2560x1440 144 Hz