I would not expect to have warranty service on the CPU and potentially motherboard if you do. As Arne mentioned, it stains. So even if you tried to revert to paste before sending it for warranty service you might get denied.
Also be aware that liquid metal (as per its name) stays liquid. If you apply too much it could leak out and create an electrical short. It's not as forgiving as paste so be sure you know what you are doing.
Personally, I would rather just repaste with a traditional paste. It minimizes the risk and a good traditional paste job will still perform quite well. Start experimenting after the warranty is up.
It sounds like the problem is that you have unreasonable expectations. Laptops run hotter and slower than desktops. There is simply less power and cooling to work with so they are not comparable. Desktop GPUs have massive heat sinks and can draw more power than all of your laptop's components combined. You can't compete with that so don't even worry about it.
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