Sorting out a warped brim. The brim on my grey fedora goes up slightly on one side. It was 1/4 inch too large anyway, so with patience, a very accurate measure and some chalk Ive worked the brim to the size Im comfortable with, however the warp is still evident where the frontal dip meets the slight upturn at either side. What is the best way of setting the brim and keeping it that way? It always seems to be problematic where the dip meets the upturn.