Results of yesterdays testing
Turning off the option above definitely helps to balance load between gpu and cpu. I only learned about this setting yesterday, I have no idea if it's exclusive to Win 11, but everybody on a laptop gpu needs to check and turn this off immediately as it is utterly pointless and problematic. What this setting does is offloads your CPU and uses your GPU for extra processing. Which is what I suspected was happening in-game. Turns out, it's a windows feature. Ridiculous. However, this did not fix the FPS buffer overflow/crash at 100% usage. If I hit 100% with this setting off, I still get the same problem.
Capping my fps at 30 greatly decreases the chances of a crash because it is essentially causing my GPU to only run at 30-50 percent power. The times when I hit 100% with this cap still caused massive frame loss, but the system was able to recover in an instant. Capping my fps at 30 made my game completely playable for hours. This requires further testing.
Today I will further test and see if I can get the game to run with 60fps cap without the buffer crashing. I am also going to play around with full-screen optimisation settings and see how that reacts.
Final thoughts - The problem is not with the GPU being at 100% usage, this is exactly what should be happening. Your GPU should be being used to it's capacity. However, that 100% usage should not be causing an issue where your FPS completely tanks into an un-recoverable situation. I don't know if this is specific to laptop gpus or mine in general as I do not have this issue with any other game. I would really like some other people with the same problem to chime in with their GPU's and experiences.