Damn that is weird, my usage is usually similar between gpu and cpu while running XC3.
Does this happen with all the mods turned off?
Also what CPU are you using?
I'm using yuzu EA 2908
+Extended memory
Add-ons:
are the exact same
I'm not having any memory issues and im about 50hours into the game. Only had issues with OpenGL
Very strange
Seems to be an opengl memory leak, vulkan fixes this but has a feww graphical issues. There is a yuzu build to fix the memoery leak though. Your GPU memory should also be full to it uses system ram to compensate then fills that up