that young man is using a fine grit stone for one thing, you are using a more aggressive grit and by the pictures you are cutting a new angle, i can see at least three angles so your not hitting the right spot, not even touching the original edge yet. Take a black sharpie and cover you r edge then make a pass and you can see where you are removing metal. You will have to correct what you have created first so stick with you diamond stone until you get one nice flat angle. Once you get the angle repaired then go on to finer stones. then what ever you use to polish your edge, strops are ok but another learning curve i would suggest a vey fine sandpaper glued to a very flat surface like your pounding granite or even a piece of glass i use a 1000 grit then a 2000 grit. The reason i suggest the sandpaper is its the same process as you use with a stones so you don't have to learn another technique. Sharpening isn't hard or rocket science , its about repeatability and practice you don't need an exact angle but you need one straight flat angle of about 15 degrees+ -
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