I'm putting some crown molding on my canopy. I bought the pre-made corners, the issue is that they sit 1/8" further than the rest of the crown. To me, it looks terrible. Is there a way to raise the rest of the crown to match the corners? Should I sand down the corners? Should I take back the corners and use the saw to cut the crown? Will Lowes take back the corners if there are finish nails through them?