So I wrapped up my finalized NES 'accuracy' palette. It's an amalgam of a few personal tweaks, the hue alignment from my direct-capture results, and uses the top-end values from the 'natural' palette. The end result looked absolutely kosher on every game I tried (using an Everdrive N8 to have access to 99.9% of the library). I tested all the Mega Mans, Castlevanias, Zeldas, Punch-Out!!, Ninja Gaiden, Double Dragons, Bionic Commando, and many other games. I tested for so long that I got burnt out. This is finally the palette I can rest on.
Here's the zipped palette file:
http://www.firebrandx.com/downloads/fbx ... alette.zip
One thing I will point out is I discovered some displays cannot handle the blueish-purple color entries coming from the real NES hardware. As a result, some graphics that were meant to be purple came out as straight blue. This is where the direct-capture hue values came in real handy in that it shows the purple tinge on those entries correctly. Examples of the bluish-purple would be in the intro to Mega Man 5 (where it shows Proto Man in blueish-purple in front of the blue robots behind him), and the first stage of Double Dragon II's floor is also bluish-purple. ON some displays, these will appear entirely blue.