Do you have any high magnification pics to back that up? I'm pretty sure I have seen several before and after shots posted by others that show no convexing at high magnification when CrOx is used with a hard substrate. I haven't seen any with my edges either when using a hard substrate, but I only have 30x optical magnification. I believe the reason a CrOx edge doesn't feel like a Shapton 16k or SG20k edge is just the nature of the abrasives used and their individual shapes. CrOx is much more of a rounded particle than the abrasives (AlOx) in the mentioned stones. P.S. I own an SG20K, and while it does give a pretty darn smooth edge, you are right - it is still nowhere near as smooth as the CrOx edge.