I never use texture filtering, as that blurs the texture. The same is almost true of the minimum shading rate as well. And for maximum texture size, I usually throw a 0 on the end of 1024 so that the full size of the texture gets used properly. Here's a good example. On the left is a render with the settings posted above, and on the right is no texture filtering, 0 shading rate, and 4096 max texture resolution. You can see the difference. It all depends on what you're rendering though. If you're rendering a close up image, use higher settings to catch all the detail. But if it's a further away shot, it makes sense to reduce things so that you don't crush your system :)