I use a scribed centerline on both edges to guage the depth/evenness of the cut.
Normally grind edge up but will change to edge down to even things up.I also will grind a blade holding it vertically on the platen, using the long surface to even up a grind. And it's not uncommon to take the blade to the vise and draw file to clean things up.
Mostly its just practice, practice practice to get things square.
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