Got it. I would rethink about placing the sensor on the hub. The reason I know this is that I use hub too to test multiple sensor modules at the same time. It end up the heat of the hub have too much influence on the sensor. You also have the sensor on top of the hub. I am guessing the heat of the hub radiated upward.
The heat such as hub is hard for our skin to sense. However, the sensor pickup this heat without any issue.
I know that it may not be realistic to change your setup. In this case, using that -6 offset maybe fine.