I had to adjust the display significantly in addition to using the color profile that I linked to.
Specifically, the contrast and sharpness settings are both jacked way too high by default. Mine ended up at 30 for contrast and 10 for sharpness.
The profile fixes the color balance issues and the contrast and sharpness adjustments addressed the washed out look.
It's still not to the level of the TB display, but then again I paid less for the mini and the dell display combined than I did for a TB display.
PS: you would not think so, but small viewing angle adjustments make a big difference. I got the best results accidentally by putting the display on top of the mini. That results in an almost perfect 90 degree angle with my eyes and the center of the screen
Give mine a try I posted it in the post above your last one.