3D Rendering - Z fighting on coplanar planes

[Master674]

Hey,

I recently added 3D rendering for Wildstar (I know not WoW but shouldn't matter).
Everything works perfectly but when I render stuff on coplanar planes I get annyoing Z-fighting.

So I heard that Z-bias is the way to go to fix this... And well I added that and now my stuff is more likely to get rendered on coplanar planes. But it's still messing around if the ground isn't flat and my texture is.. I still get Z-fighting on the edges. So I read up even more on it and shifted my projection matrix away from the viewer.

Note that I'm using the games projection matrix directly (the same one the game uses itself to render the world). But the game doesn't seem to have Z-fighting issues at all, so I was wondering how they do it?