I have honed one of these razors, German steel, blade face etched Luna...
I don't remember anything different about it, seems to me it took a rather good edge...

Just a suggestion, when you get stuck, first step away from it for an hour or two..

Then when you get back to the razor, change something up,
Examples:

Change grit for 10 laps, up or down
Add 1 layer of tape
Subtract 1 layer of tape
Change the stroke from an X to a straight or visa-versa
Do 5 back hone strokes
Do 5 laps with two hands and a touch of pressure
Strop the razor 50 laps

But change something in the dynamic...
See if that helps