Take this for what it is worth...it is only my idea of a helpful hint.
I would not be able to find your stamps on
ebay if I was looking for them. This is only my opinion, but I don't think it is reliable to figure that the
ebay category in which you list an item will narrow down a buyer's search.
Sometimes I use the hierarchies in looking up stamps, just to see what is out there, but usually I just use the search function. There are a couple of exceptions for things that are hard to categorize. I don't think I am alone in this.
For instance, if I am looking for an particular Spanish airmail, I will search for "Spain C57" first in the general search box. If that doesn't give me a hit, I'll try "Spain airmail." Personally, I rarely use the "Stamps|Europe|Spain|Back of the book" (or whatever it would be) directories to find something specific.
To me, it is the difference between the older "Yahoo" way of searching the Internet, and newer "Google" way of searching.
All of this is to say that I would put the country in the item title, along with the Scott number (which I see you often do include) and maybe a one- or two-word description (e.g., "Bridge" or "flower" to capture the topical searchers).
Just my .02.
Collin