CALLING ANDREW RODNEY !
I suspect ANDREW RODNEY has the answer to what you are experiencing. I just read an article he wrote in the January issue of Professional Photographer magazine entitled "Color Management in Lightroom". It was VERY interesting as it appears that Lightroom is really working in a variation of the ProPhoto RGB colorspace, and then converting the numbers when you export to sRGB or AdobeRGB. There are only three export colorspace options in beta 4.1 LR; sRGB, Adobe RGB, and ProPhoto RGB.
In the article in PROFESSIONAL PHOTOGRAPHER, Andrew states that...
"Adobe recommends choosing ProPhoto RGB to preserve color details when exporting from Lightroom. Since ProPhoto RGB has such a large gamut, Adobe recommends exporting the file in 16-bit color. Lightroom automatically converts images exported from the Web module to sRGB."
Since Andrew is one of the moderators I believe on these forums, maybe someone can point him to your post Tim.
In the meantime, you might try exporting some of your files in ProPhoto RGB and see if it makes a difference. By the way, I use the NEC 2190Uxi display with the built-in LUT and calibrate it using the Optix XR with the NEC Spectraview II software. I haven't seen anything to suggest there any kind of issue between LR and the dispaly hardware/software.