Excessive screen tearing

Mac mini with M4.
experiencing excessive screen tearing making the beta unplayable
it starts off fine and I think the issue is fixed but within just a few mins I can no longer see the ground I’m walking on and there are massive graphic ‘walls’. sometimes changing the camera angle so I’m looking at my chars feet helps but does not solve the issue.
I have tried changing settings to the ones I use for Cata classic with no luck and tried lots of different settings to no improvement.