pastrychef,I have always been under the impression that GPU fan behavior is controlled entirely by the GPU and its BIOS firmware in macOS. On Windows, it's possible that drivers can allow for custom fan settings but none of this exists for macOS.
I don't think that Clover has anything to do with the way the GPU fans behave. I am also unaware of any Clover versions that improve the way the Nvidia web drivers works.