If you are not feeling hungry or tired, then you are eating enough. Note that you may need more once you reach your stable weight and are no longer drawing on your body's reserves.
The meat and vegetables are fine. Sweet potatoes, cheese, and butter are not really paleo, though grass finished butter doesn't seem to be much of a problem for most people. You don't say how much fat is on your meat, but full fat meat - say 75% lean for the burger - is generally ideal if you can get it.
