Anyhow, back to the shelves. I used my 6' level to straighten out the shelves, since they are currently not fastened to the wall. You can see here that the level and the shelf are aligned well.
After straightening the shelf, I marked a line on the wall, underneath the shelf. I will pull the shelves off, and add a 1/2" or 3/4" square underneath the line, and fasten that to the wall. When I put the shelves back up, I can then fasten the shelves to the square wood to keep the shelf level, and help support the weight of any items we put on the shelves.
The red square indicates where the extra wood will go to support the entire length of the shelf from side to side.
Between the brace at the back, and the face frame on the front, that should keep the shelves nice and flat.
