Thanks for you advice.
"Selective" is in the "to avoid" list here on this site. So strop I have seems to be poor quality, the leather is not very flat.
Fendrihan is not an ebay seller (
Fendrihan, Traditional Shaving Supplies), here is the comment for their pre-sharpened SR:
"This blade has been honed by D. Gauthier, an experienced straight razor sharpener based in Montreal. Mr. Gauthier has honed and restored hundreds of razors for clients all over the globe."
With my safety razor, I never shaved ATG, always WTG to avoid ingrown hair. So even with a SR, I don't think I will shave ATG.
From some video I saw, a good SR can cut a hair easily, so I would expect a SR shave a lot better than my DE (I can't cut a hair with my DE even with a new blade).
I have been able to shave all part of my face (except chin and lip) with my "Selective" (poor quality) SR honed by me with 1200 sandpaper, so I don't think I will have any problem with the technique.
That being said I think I will buy a new Dovo new with a good strop! If I don't like it then I will re-sell it! :-)
Thanks!