I am guessing that no matter who set the initial bevel that they don't last forever. I would go to the 5K Nani and hone to reset the bevel and use whatever test you do to prove it is set, mine is that it cuts arm hairs easily all along the blade. It could take a bit of time at 5K. For me there will be much fewer strokes on the next two stones as you are only really polishing the bevel and edge. Yea a jewelers loupe and a felt marker can be very handy to see your progress otherwise you can be just guessing.

Bob