Some silly question, but maybe they can be useful.
How is the rig built? Open-frame?
How about the distance between GPUs?
What's the temperature in the room?
All those factors can massively impact GPUs temperatures, your software setting seem right
It is my first rig, open-frame. see the picture for the distance between GPUs. My city is hot about 44C, room temperature would be about 35C.
https://ibb.co/nHMeMQhttps://ibb.co/nBFvvk