I'm not sure whether this is expected behavior or not, but...I installed and set the RPM slider all the way right. The fan spun up audibly and the cooling was amazing. I then tried to lower the fan speed, but it seemed to ignore my new setting, even after I quit the app. It wasn't until I restarted the app that the fan speed came down.
[Version 2.2.2]
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smcFanControl