You forgot to measure SOC temperature under load. It is reaching toasty 100 °C under just single core loads. Also the SOC is severely underpeforming because of that, it is always running at just 85% of maximum frequency (GPU for example NEVER (and I really mean never) reaches 680 MHz, only 615 MHz, thats almost 10% performance lost, same with the CPU.
Xiaomi seriously screwed up cooling on this tablet, as the SOC doesn't seem to have any adequate cooling solution like heatpipe or even just thermal contact to the body whatsover, based on the insane rate the temperature rises under the slightest of loads (jumps from 30 to 70 °C when opening apps or swiping in launcher in a fraction of a second).
This makes the device very unreliable, as such thermal cycling will eventually crack the solder joints on the SOC. All of this could have been avoided, if there was just a tiny bit more of thermal mass (like the 12 inch aluminum body).
Im really regretting buying this tablet, as with combination of extremely buggy and lacking OS, along with zero software support and total ignore from Xiaomi regarding any issues, it feels like I bought cheap 50$ knockoff and not "premium 700$" tablet.