I really don't recommend liquid metal TIM for your MacBook.
Yes, liquid metal is able to transfer heat a bit better than ceramic or diamond TIM. I've found Arctic Silver is just fine without the risks.
These exotic metal compounds have risks! Getting onto the logic board can destroy it. I've replaced two after someone messed up.
I would recommend you re-think your usage as a laptop is not able to perform as well as a desktop when running heavy processes.
I would recommend you be more aggressive in keeping your system dust free. Running a good thermal sensor & fan monitoring app like TG Pro. TG Pro also allows you to ramp up the fan (turbo) just before you run your system hard.
As you can see here, there is no fan or cooling system
The CPU is under the left shield between the fingers.
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