Feel free to correct me. Crust is most effective when the phone is not in use. As for the temperature while using the phone, it seems as though the throttle temp has been set at/near 50C recently. A noticeable difference from what it was, probably 70C.
"Crust improves battery life and thermal performance by implementing a deep sleep state. During deep sleep, the CPU cores, the DRAM controller, and most onboard peripherals are powered down, reducing power consumption by 80% or more compared to an idle device. On boards without a PMIC, Crust is also responsible for orderly power-off and power-on of the device."
Source: https://github.com/crust-firmware/crust
"Crust improves battery life and thermal performance by implementing a deep sleep state. During deep sleep, the CPU cores, the DRAM controller, and most onboard peripherals are powered down, reducing power consumption by 80% or more compared to an idle device. On boards without a PMIC, Crust is also responsible for orderly power-off and power-on of the device."
Source: https://github.com/crust-firmware/crust