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also the case is not closed
That would explain the high temps. The case aids the cooling, it directs the airflow
The bios reads unknown because you need to add the correct line to the evox ini. Scroll down the ini on the Xbox looking for the id that says current. Copy this line and add whatever name you want for the bios into it (look at the other lines and the formatting is obvious) insert this line into the section with the other Ids and thats sorted.
Make sure your drive is formatted to have Partition 6 & 7 (F+G) and your bios is edited to support the g drive and not just partition 6 which will give you all the space on F.