Bumping RPMs question

Hello everyone and happy new year and happy holidays 🙂

So yes I am using smcFan i know its not all that good and people don't really recommend it but even so i use it at my own risk.

I just have a question about the fans in my 21.5" iMac the 2010 model to be precise. So constantly monitoring the temperature of my HDD and i reed about the HDD and how that piece of hardware is the most temperature sensitive. So my hdd under load goes up to 45 - 48 that is kinda the max with smcFan on of course.

I usually run smc fan a lot may not be the right word but mostly 70% of the time fans are at a higher RPM than usual.

Now can someone with some knolage please tell me how to set the RPM's for the fans and for how long to run them. If needed i will provide temperatures and other data.

Thank you very much.