Right now we have no support for setting fan speeds. I want to add this at some point but right there is still a lot of “bigger fish to fry”
The fans also work with a hysteresis, i.e. if the fan starts to spin at 70C it will not stop again at 69C, it will cool down further before. If it would not do that you would get terrible on/off jitter
the problem is the CPU temp is being incorrectly reported to the EC, as well as the fan ramping up too quickly. Both of these will be addressed in a future EC firmware update