I found a correction file for my Spyder 3 […] I ran DispcalGUI with the correction and the result differed in the gamut mapping:
Sure, this is expected.
Should I trust this new result?
Without a more accurate instrument to verify (e.g. a Spectrometer), it’s hard to tell. The result with correction looks more plausible though, as it more closely matches some of the gamut graphs found elsewhere on the web .