You need to adjust the upper temp thresholds. What you have set would be valid for a CPU but your fans won't reach run 100% till your hard drives are 80°C. [emoji33] Something between 40 and 50 would be appropriate. Below is what mine looks like currently. FANA connects to 2 fans on the hard drive and FAN1234 are CPU, intake and exhaust fans.
Also the minimum of 28 keeps my FANA at or above 300rpms. Will differ between systems. I have edited my Sensors config for each fan section like this. 200 for FANA and 300 for FAN1234. Not setting this will make your fans run at full speed if they drop below the OEM values which I believe were 700-500. Check you event log for threshold warnings.
## Give valid input for sensor type = Fan; units = RPMLower_Non_Critical_Threshold 200.000000## Give valid input for sensor type = Fan; units = RPMLower_Critical_Threshold 200.000000## Give valid input for sensor type = Fan; units = RPMLower_Non_Recoverable_Threshold 200.000000