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The common denominator in your issues would be your PC. If games are working according to protonDB and you’re unable to get them to work on multiple distros that suggests its your PC.
There are two candidates in your specs - your RAM and your Graphics card.
As others have said, asymmetric RAM is unusual and it certainly was warned against in the past as it caused system issues. While OSs may be much better at managing RAM now, that doesn’t mean all scenarios can tolerate it. Given what Proton is doing is complex (running Wine, which is essentially a windows layer) I would not be surprised if the memory configuration is just a step too far - you have windows software using a windows compatibility layer for memory asking a linuxn system for memory access.
An obvious way to test this is to remove the 16gb stick from your machine and see what happens.
The other side is your graphics card - are you using the latest nvidia drivers?
Its not about memory size its about the asymmetric sticks. It was a classic problem with OS memory management in the past. Modern OS are better at dealing with it but it is not the optimal set up.
You’re running windows game which use proton/wine that manage memory for the game and use linux for access to RAM. The asymmetry could conceivably cause issues you wouldn’t notice with native apps.
I’d try removing the 16gb stick (or the two 8gb sticks and keeo the 16gb stick; all that matters is whatever ram isnleft is the uniform) and see what happens with the games you’ve been trying. It might not he the issue but the only way to know is to test it, rather than dismiss it because its not what you expected.