This is my home improvement project for the year. I have a big shelf in my closet upon which many things sit and from which many things hang. The shelf is held up by three of these triangular support brackets, one on each end and one in the middle:
The top screw in that one has become fairly loose (as well as the one in the middle support brace, but not nearly as much), and the shelf kind of slopes noticably, although not so much that stuff slides off the shelf.
Now, there's quite a bit of weight on this thing, and I'm paranoid about it one day ripping out of the wall. I decided I should put some sort of metal brace on each side--particularly the side in the picture--as shown by my incredible artist's rendition within the photo, so I bought two "zinc-plated 76mm corner braces". Now here's me question: should I place the braces such that they're supporting the shelf as it sits now, or place them a little bit higher so they're supporing the shelf in its original, non-sloping position? Which is more likely to prevent the shelf from crashing down onto the floor in the middle of the night? I have no idea how deep the screws in the original support brackets are, but the ones that came with these things supposedly require 5/64"/2 mm pilot holes.
HELP SAVE ME FROM A CLOSETASTROPHY!

The top screw in that one has become fairly loose (as well as the one in the middle support brace, but not nearly as much), and the shelf kind of slopes noticably, although not so much that stuff slides off the shelf.
Now, there's quite a bit of weight on this thing, and I'm paranoid about it one day ripping out of the wall. I decided I should put some sort of metal brace on each side--particularly the side in the picture--as shown by my incredible artist's rendition within the photo, so I bought two "zinc-plated 76mm corner braces". Now here's me question: should I place the braces such that they're supporting the shelf as it sits now, or place them a little bit higher so they're supporing the shelf in its original, non-sloping position? Which is more likely to prevent the shelf from crashing down onto the floor in the middle of the night? I have no idea how deep the screws in the original support brackets are, but the ones that came with these things supposedly require 5/64"/2 mm pilot holes.
HELP SAVE ME FROM A CLOSETASTROPHY!