I am trying to improve the edge of razors coming off an 8K Norton. I used some lapping film: 0.5µ Chromium Oxide. I got this from Lee Valley. They also have: 1µ Alum. Oxide Film, and 0.3µ Alum. Oxide Film. Would these be better?

I did 40 passes coming off the 8K Norton. I thought because of the grit difference I might need more passes. The edge was noticeably better when shaving. I think less irritation.

Would like to know if there is anything that I should change, the grit size or number of passes to make things better?

Joe