If I do the secondary bevel as to create a convex edge as ed was explaining I don't worry about the angle to much...yeh it gets wider for chopping knives and slimmer for slicing knives.
If I do the secondary bevel on my edge pro (similar to what you are using I assume from the pic you have a lansky sharpener or something similar.) my edge pro is a beefed up version of that it produces a flat bevel if its for a every day carry knives most knives get around 20 deg angle
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