Associate
Don't run gpuz and see if you still get 100% gpuz usage. I have removed mine from running at startup and no issues now until I manually run it.
I've also noticed that if it crashes in a test, it's hard to get decent scores again sometimes without a reboot.
Ive tried it with wattman running instead and with nothing, still get the same scores, it was 3011 in time spy graphics score which is the lowest by far, the others are in the 4000's, can't even beat the lowest 290