When I started out in the honing game I used SiC wet & dry paper (in wet mode, i.e. with water but some folks use WD40) on a flat tile to flatten my hones. I used my 325 DMT to sharpen plane irons and wood chisels before I ever applied it to a hone. By then it was just right to bring hones to a smooth flat surface - or to generate slurry for faster cutting.