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Have you tried Safe mode, https://support.apple.com/en-us/HT201262?
Have you tried OnyX, https://www.titanium-software.fr/en/index.html? Just be sure to get the correct OnyX version, to match your macOS version. Run the "Maintenance" default tasks.
I have also noticed previously, that sometimes multiple SMC resets were required to fix some issues. At least, on my 15" Late 2011 MBP they were needed.
So I ran Onyx like you recommended and waited 2 weeks to see if anything changed, and wadyaknow! No fan issues since, so I'm going to assume the issue is fixed, thanks!