This application allows you to fully unlock the BIOS for the Clevo PB70EF-G/PowerSpec 1720 among other related models. It's not Prema but it's the next best thing.
https://www.dropbox.com/s/8wuvxbxz6qrutmk/InsydeH2OUVE_x86_WINx64_200.00.01.00.zip?dl=0
I have used MasterGel Maker, Noctua NT-H2, and Thermal Grizzly Kryonaut. My favorite is the MasterGel Maker. I typically apply a line on each chip and spread it manually very thin with a plastic card.
The factory fans in the CLEVO PB70EF-G and I use Thermal Grizzly Kryonaut paste. I use 2 coasters to prop the back of the laptop up for additional airflow. My room temp averages 21-23C. This laptop has a good heatsink design from Clevo.