So anyway after I just took off the diamond shield-no more rattlin problems!
Wasn't half as hard as I thought it would be. It looks like the diamond shield was bowing out (this was a display model), and hence that was probably the cause of the rattling. Frankly the tv looks fine without it, so I think I'm going to keep it off..
TIME TO BLAST THE MUSIC!!! WOOO NO MORE RATTLING!!!
-Jason