Originally Posted by
Utopian
In that case you have a new problem...
Tape slightly lifts the spine and so slightly changes the angle of the blade relative to the hone. As the tape wears, which it is most prone to do on your lower grit bevel setter, the spine gets closer to the hone and the very apex of the bevel (aka the edge) lifts up away from the hone. So as the tape wears you are constantly lowering the angle of the bevels. Putting on a fresh piece of tape and doing maybe 10 more laps ensures that the edge actually is making contact with the hone.
As Rezdog described with using a loupe, I assess my edges with a stereomicroscope.