Mine is 150...400...600...1200....2000 paper. Since I picked up the guide I have been very satisfied with the results.... but paper is a huge pain. Plus, I don't get the same results with my new chisels. Sharp...yes. But they take a lot longer than my high carbon old ones. I feel like I've got to make a change....
Patience Grasshopper!
I bet the new chisels will take longer to sharpen
Those Narex are probably much harder (tougher not "Rockwell C harder") than your old chisels.
Our metallurgy today is VASTLY different from just a few years ago...
But I will also guess when you get a good edge on them it will last longer!