Similar Problem. Not really happy with my new NEC PA271q... First NEC after a few Eizos and never had such a bad calibration. All my displays before that were much closer to Rodney's NEC delta.
I tried a few things, but couldn't improve much.
First Image shows, calibration before Firmware and SpectraView update.
Second shows calibration to Rodney's target. Much better, but still not close to his NEC.
Last one is my target again, also better, but still not great.
Perhaps I'm expecting to much, but the PA271q got so great reviews, so I'm surprised about it's perfromance.