I've been using the NEC 3090 for a few months now. I've calibrated it and profiled with SpectraViewII, older and newest versions, and the Eye1 Display 2 colorimeter, which is over a year old and not tweaked for the wider gamut of the display. I use "Factory Settings" or whatever the term is for profiling the primaries.
Regardless of the settings in my calibration the reds seem to pop, especially when viewing my older photographic work. My current settings use 140 cd/ms as the luminosity, 2.2 gamma, D65 as the white point, and I am used to the red's "high saturation."
One answer to what you are seeing is this: The display color gamut exceeds even Adobe RGB, precisely at the brighter and more saturated corner of the Adobe RGB red boundaries. I don't think we are seeing a problem with the generated profiles. My old and very good monitor (NEC DiamondPro 2060u) was basically an sRGB display (I believe, anyway,) and I received a surprise when first seeing my older images, done either in the Prophoto or Adobe RGB color spaces, on the NEC 3090.
I might be wrong about this, but I think it is in part, at least, a matter of getting used to the larger display gamut.