The Al13 does not glide smoothly over my face.
I guess I would describe it as feeling resistance when using the razor. In the case go the Henson, I'm guessing that it's due to the fair amount of surface area that is against your skin. It's the only Aluminum razor that I've ever used, so not sure whether or not the material plays into it, too. Whatever the case, it creates enough drag/resistance that I don't really like using it very much.
My Timeless SB can exhibit this as well, but to a lesser extent and I usually only feel it if I try to go over that same area more than once. It removes a lot of lather with each pass and has quite a but of surface area, so not a good combination if you try to go over an area multiple times without re-lathering. With the Henson, I feel some drag even on the first pass.
I do feel the Henson if a good razor and it's obvious just from seeing it in person that it's well engineered, but for me, I just don't like it near as much as my other razors (i.e. Feather, Wolfman, & Timeless) and it mostly comes down to that drag sensation.
Interesting. I tried to replicate the drag out of curiosity.
I never noticed this drag issue using Officiana Artigiana Milano Stay Traditional and slightly riding the cap or bar.
I can only replicate it if I use a completely neutral angle AND/OR use a thick dense lather. I would categorize Southern Witchcrafts as low structure lather. For my test I used SW with much less water than normal to increase density and noticed the drag. However, I don't think that was a very realistic test because prefer wet and runny lather, like Yoplait yogurt or wet paint. So I added more water and the drag went away.
I find it very odd that the instructions say to use a completely neutral angle. I find that completely ineffective for me. Maybe I need to experiment more.
The drag you mention reminds me of boat racing. They don't race if the water is completely calm. There needs to be a little wind to chop the water, otherwise it's not safe to race. Something about hydronamics that I don't know how to explain, like the boat sticks to the surface of the calm water and hydroplanes but doesn't happen with slightly choppy water.