Hi everyone!

I am fairly new to straight razors, but thanks to all the info I could gather on this site, I already managed to have a good shave with my straight razor. Here is my problem however :

I ordered a "shave ready" Dovo razor, which, as you can guess, was not shave ready at all (completely failed the hair test). I honed it for quite a while with a chinese waterstone (advertised as a 12.000 grit) until it passed the hair test.
I stropped on a linen strop pasted with "puma extrafein" paste, then on regular leather.
All my shaving products (soap, badger...) give me great results with a double-edged razor, so the problemn isn't there.
I now get a more than decent shave with my straight razor. It is slightly better than with a regular Gilette, but far less close than with my Merkur adjustable fitted with Feather blades. And it takes me too many passes to get there, when two should be enough it seems.
Of course my DE technique is fat better than my straight shaving technique, so it must account for a part of the difference.
Anyway, I feel my beard could use a sharper razor (Feather blades are wonderful, even though I don't think I need my straight razor THAT sharp).
Question is : what is the diameter of the particles of the Puma extrafein paste?
I have no idea what it is made of, though I guess this is Chromium oxide, as the paste is green. A thourough search on forums would lead me to think the paste is 0.5, but I cannot be sure. Does anyone haave any info?

Do you think having another strop or a paddle with a diamond 0.25 (or finer?) paste would help make each pass more efficient and up with a closer shave?

Thanks a lot for reading through all this