You've attached the proper skill to the root templates you're making, right? Under "OnUseAction" in the root template? That attaches the skill and the skill description to the skillbook. The name should be part of the root template, but you might have to make an entry in the TranslatedStringKey for the object stat entry for treasure table drops.
Another thing is, are you copying the GUID of the root template to the object "link" in Stats/Generated/Links/Object.txt, or the "Root Template" section in the Object.xlsm? Just right click the root template in the root templates window and hit "Copy GUID to clipboard" and copy that string to the link entry for your skillbook to the xlsm or txt file.
