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I used to do it alot too. I don't anymore, unless I'm having a problem with a blade. I then use that to eliminate one variable from the equation. It is precisely because most blades are not 100% true...

I like to take a sharpie, magic marker, whatever, and run a line of color on the bevel. Then see if I'm making contact from heel to point. If not I adjust my stroke. Might be a rolling stroke, might...