Get it to shave better - not easy to diagnose because we have no idea exactly what the edge is like/shaving like now.

I would suggest trying another 20 strokes on the 8k and then shave right off the hone. Keep doing that until you see no improvement.

Of course, there is always the chance you need to go back to the 4k first.

Or maybe you need to go back to the 1k.

Or maybe just 10 more strokes on the chrome ox would do it.

Without being able to shave with your razor, it is very very hard to say. Probably impossible. Often, even when I can shave with a razor and find it's not quite there, my first guess/try at fixing it won't work.

Play around, top down, and see what you can do. That's probably my best advice.