Hi Martin
Your a star. I did what you said and used UV coordinates instead and also scaled the brick texture with the mapping node (0.5, 0.5, 0.5) before baking. And that did it, no issues with anti-aliasing. The grooves are even and look good, at 1K now. If I setup a floor material with my baked textures and scale them just as I want it still looks good.
So thank you very much Martin!