This is no help to you but I am at a similar junction. I get every edge where I like it for shaving comfort. Do I need to buy the next stone? Probably, but do I need it? I have decided my quest for silent mowing of my hair is probably unnecessary. Close, comfortable and durable edges.

If you did reach crazy sharp, how long is it going to stay crazy sharp? The edge will be microscopically thin and fragile. Hecht. They are microscopically thin and fragile now.