Defender P10 NH77DPQ-M overheating issues and thermal pads replacement

[TikIThorsen]

Recently got this notebook (used, second hand) and right after turning it on it was overheating, as in booting into windows and updating it; I could hear the fans going full speed and the whole notebook was hot, including the keyboard and this was just watching a YouTube video, the CPU reaches hovers on 80C.

Using "Control Center 3.5" and changing power modes makes little difference to the temps, from power saving to gaming mod the only thing that truly lowers temps is with "Fan Speed" app, setting the fans to MAXIMUM speed all the time.
The problem is that, even though I manually added Fan Speed to windows startup, it does not always loads into the maximum settings, half the time I need to do it manually, it defaults to "Automatic" (AKA overheating mode)

I tried to do an CPU undervolt but this notebook's BIOS is locked for that. I tried all the suggested methods for Intel XTU and ThrottleStop but nothing works, all voltages are locked. (Apparently is disabled in the BIOS and there is no option to enabled it)

So, as a last resort, I decided to disassembly the notebook, and besides the dirty/dusty fans, I notice that apparently the previous owned did some maintenance some time ago, with some excessive thermal paste.
The thermal pads were in bad shape, in fact it took me quite a bit of work to remove the whole cooling system, since the thermal pads where stuck and not sure if some broke off with my removal or were like that before from the previous owned tear down.

I did a full clean up, blowing the fans with compressed/canned air and replaced the thermal paste with Arctic Cooling MX-2. The temps did lower some degrees but still hotter then it should, even with the fans at 100%. The picture beflow is after the clean up, just playing a Youtube for around 5 mins with fans on Automatic.

Sadly I could not replace the thermal pads because I did not have any and don't know the correct height, they seem to be 2mm but can't be sure.
Does anyone know the EXACT height in milliliters of each thermal pads rows I need to buy to replace them?
And also, besides getting a Cooling Pad, is there anything else I can do to improve temperatures?

The notebook will not be used for gaming, is mainly for high end video editing in Adobe Premier.