I understand your pain. It's bad when you find out the things you trusted can't be trusted. Stupid me, I bought that MM paint, blew my cockpit, and THEN realized that the color was all wrong. I thought it was right at first and the more I looked at it, the more wrong it became.
IPMS has "Color Chips" of the standard colors. My recommendation would be to get those that you have questions about, open them in some graphics software and see what the RGB color is, then compare that to the colors on the manufacturers sites. Don't trust your monitor, it will lie to you! The RGB mix should be right though.
If you put yours on a web site, send me a link so I can add it to my links page. If you don't have a site, I'll post it on mine (with credit to you, of course).