Vibrating/incorrect colors when moving the mouse?

[BTA1138]

Blacks are really really crushed when I switch my 2nd External monitor to "Mirror for Dummy 16:9". When I move my cursor over to that monitor, it flashes with every move, and the "flashed" picture is the correct gamma/colors, but I can't get it to stay that way. Once the cursor stops moving it reverts back to the wrong gamma/crushed black look. My monitor's model is DELL U2515HX. It's an HD monitor and the highest resolution is 1920x1080. I was hoping to use BetterDummy to increase the scaling to match my M1 iMac. Attached is a screenshot of my settings:

[waydabber]

Hi, you might want to try to change the Color Profile to the default or attempt to match the color profile of the dummy to the display's. That might help (but I am not sure, I could not recreate the flashing issue, but few others mentioned it too).

Also, if you use Monterey 12.1 beta3, it has a glitch in how color profiles and gamma is handled which might make things worse with custom profiles.

[waydabber]

See these about this issue (related discussion):

#122 (comment)