First, a little background. I have an RC-4 that I've sharpened to a shaving sharp edge. I haven't had the opportunity to really use this knife since it's last sharpening (about a month ago) but it continually pops hair right off my arm without a problem. Just like it should. Now my Izula, that's been sharpened the same way, will remove a bit of hair once or twice and then just stop shaving until I hit it with the ceramic rod again. I sharpen both knives the same way. I use DMT mini folding stone (red and green, whatever's needed) and a 4" long ceramic rod, both by hand. but the Izula just doesn't seem to keep the same edge. I've been wondering if maybe the different blade thickness means they should be sharpened a little differently to keep a good edge? Or is it possible that there might be something wrong with this Izula (I doubt it)?