I'm just learning from those who know more than me. The different grinds on each side were suggested my Michael Rader, but I took it a step further and offset the flat. I was doing that before with the full flat grind, but the convex on the one side has been a big improvement. I have tried 60/40, 70/30, and 80/20, and they all feel just a little different. I think I like the 70/30 the best. One of my buddies/customers preps a lot of raw chicken as he breeds monitor lizards. The offset convex dropped his chicken prep time from 20min to 5min! Its like a less extreme version of a sushi knife. I have this evening free. I'll take some pics and post a new thread with some of my work/designs to introduce myself. Would you be interested in a knife at cost to test the design? You can e-mail me through my profile, since we can't sell through the regular forums. To me this isn't a sale, but a chance to test the design. If I have broken one of the rules, I will edit the post.